Part I: Esperanto Grammar

13. Affixes (Prefixes & Suffixes)

Zamenhof sought to reduce the word-learning burden of Esperanto by allowing individual roots to be modified by a small set of affixes (prefixes and suffixes). This would create additional vocabulary out of familiar elements. This section includes a list of the “official” affixes, examples of their use, and a few comments about them.

13.1. Prefixes

bo-
The prefix -bo- is attached to a kinship term to indicate an in-law relationship:

dis-
The prefix dis- suggests dispersion in all directions.

Ŝi disrompis la vazon. = She smashed the vase to bits.

Li disdonos prospektojn. = He’ll be giving out tracts.

Ŝi aŭskultas sekretajn radiodissendojn.
= She listens to secret radio broadcasts.

Li dissendadas fileterojn.
= He keeps sending dirty letters around.

Li vaste disbabilis pri la sekreto.
= He yammered to everyone about the secret.

ek-
The prefix ek- emphasizes the onset of the action of the verb, in contrast to its continuation or completion:

Ŝi nur hodiaŭ eksciis, ke ŝi estas graveda.
= She found out only today that she is pregnant.

La terura monstro ekvidis la glavon de Daĉjeto kaj ekforkuris.
= The terrible monster took one look at Little Davey’s sword and fled.

When it is attached to intransitive verbs, ek- has an effect very similar to attaching the suffix -iĝ-.

Ŝi eksidis ĉe la tablo, tute ne invitite.
= She sat down at the table completely uninvited.

Ŝi sidiĝis ĉe la tablo, tute ne invitite.
= She sat down at the table completely uninvited.

For more on this, see the sections on -ig- and -iĝ- in this list and in Part I. Contrast the suffix -ad-.

The expression ek al has become colloquial to mean roughtly “let’s get started”:

Ek al labor’!
= Let’s get to work!

Ek al Berlino!
= On to Berlin!

eks-
The prefix eks- (cognate with English ex-) means former:

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fi-
The prefix fi- is disparaging and indicates that the root refers to something of low moral quality.

Caution: Some (most) Esperantists distinguish between -aĉ-, as referring to something that is of poor quality or broken down, and fi-, designating something immoral. However a few speakers consider these two affixes to differentiate what is objectively bad (-aĉ-) from what is subjectively worthless (fi-). Speakers of the second kind sometimes use fi- as a polite way to speak of their own productions or efforts:

Mi ĝojas, ke miaj fikantoj plaĉas al vi.
= I am happy that my humble songs please you.

Such a usage is a jarring error and should be avoided, but do not be alarmed if you occasionally hear fi- used this way.

ge-
The prefix ge- indicates that both females and males are explicitly included:

This prefix is commonly omitted if there is no possibility of confusion and if there is no particular desire to stress that both sexes are explicitly included in the word. Talking about a field of sheep as geŝafoj rather than simply ŝafoj is just as silly as it seems (or it implies an unusual interest in the sex of sheep). The ge- is NOT omitted for kinship terms or with the word gesinjoroj. See -in-.

Since ge- specifically includes both sexes, it is traditionally used only with plural nouns. However in recent years it has become common (although not universally well regarded!) to use it with a singular noun to stress that sex is irrelevant. This usually occurs with kinship terms, since these are words in which the unmarked form is unambiguously male:

Vi bezonos noton de via gepatro pri tio.
= You’ll need a note from your parent about that.

Vi rajtas inviti nur unu gefraton al la festeto.
= You may invite only one sibling to the little party.

Some people jokingly extend the usage of ge- in various ways, but such extensions are not yet standard and should be regarded as experimental, humorous, and what have you. Here are a few examples of such non-standard extensions:

*-Caution for students of Romance languages: Mal merely reverses the meaning of the root. In and of itself it does not mean or imply “bad” in any way. La malo means “the opposite.” It does not mean “badness”!

mal-
The prefix mal- causes the root to reverse its meaning:*

Needless to say, this prefix can be used only with roots that are able to have a relatively unambiguous opposite. The word ananaso means “pineapple,” but malananaso would be meaningless!

In compounds, mal- reverses the meaning of the first root only; it does not apply to subsequent roots or suffixes. For example, a malbonulo (literally an “un-good-person-noun”) is a person (ulo) who is bad, not a good non-person; similarly, a malbonfarulo (literally an “un-good-do-person-noun”) is a person who is a doer of what is “ungood” not a “good non-doing person” or a “good-doing unperson” (or an “unnoun”). Suffixes (like -ul-) therefore refer to the reversed unit, including the mal-.

The mal- prefix was devised to reduce the number of roots and decrease the learning burden for Esperanto. Thus if one knew the word bona, one automatically could form the word malbona. From the beginning, however, some speakers have felt uncomfortable with some such compounds (largely because the element mal has negative sense in many European languages), and words were proposed to replace some mal- words.

Although over time this logic has not prevailed, many of the substitutions have entered the language (usually without driving out the easily recreated mal- words). Indeed, Zamenhof himself used some of the early “replacements.” In other cases, the mal- words have receive preference, and proposed replacements have remained less common or even unused.

Here are three somewhat arbitrary lists of doublets. Paired words in the first list are essentially interchangeable. In the second list the “replacement” is more narrow in sense than the mal- word it only partially replaces. In the third list a raised cross (†) shows which of the two has largely vanished or never caught on in the first place.

absurda = malracia = irrational, absurd

aflikti = malĝojigi = sadden, afflict

amara = maldolĉa = bitter

aŭdaca = maltima = audacious

breva = mallonga = brief

cis = maltrans = up to but not across

despero = malespero = despair

dista = malproksima = fora = distant

dura = malmola = hard (not soft)

efemera = maldaŭra = temporary, fleeting

eta = malgranda = small

falsa = malvera = false

fiaski = malsukcesi = miscarry, fail

fiktiva = malreala = fictional

frida = malvarma = cold

*-It is unclear whether liva = “left” is coming into general use, although we may hope so. Especially in international transportation it would avoid confusion between dekstra and maldekstra, which sound too similar when spoken in noisy environments (for example when road instructions are given in cars).”

hati = malami = hate

humida = malseka = damp, wet

infre = malsupre = below

kurta = mallonga = brief, short

lanta = malrapida = slow

lasciva = malĉasta = lascivious

*liva = maldekstra = left (side)

lontana = malproksima = distant

loza = malfirma = malstreĉa = loose-fitting; loose-packed

manki = malesti = be missing

milda = malsovaĝa = mild

neglekti = malzorgi = neglect

*-A few speakers (includidng me) distinguish between being physically old (maljuna) and being old in one’s manner or point of view (olda). This would fit with the emergence of the term olduloj as a faintly derogatory term for older people who resist change, as seen from the perspective of the junuloj. However, this distinction between olda and maljuna is only emergent and is not consistently observed.

noci = malutili = damage, inhibit

obskura = malfama = unknown, obscure

obskura = malluma = dark

obstaklo = malhelpaĵo = barrier, obstacle

olda = malfreŝa = stale

*olda = maljuna = old

orgojlo = malhumilo = pride, egocentrism

ovri = malfermi = to open

perversa = malvirta = perverse, perverted

pigra = maldiligenta = lazy

pisi = maltrinki =urini = to urinate

plumpa = malgracia = crude, clumsy

*poltrona = malkuraĝa = cowardly

povra = kompatinda = poor (pathetic)

povra = malriĉa = poor (without money)

rara = malofta = rare

sob = malsupren = suben = downward

sombra = malhela = dark

*-This provides an excuse for poltroni = “to chicken out”!

sordida = malpura = dirty

strikta = malvasta = tight, narrow

stulta = malinteligenta = stupid

stulta = malsprita = stupid, dull

svaga = malpreciza = vague

svelta = maldika = slim, slender

tarda = malfrua = late

trista = malgaja = sad

turpa = malbela = ugly

ŝrumpi = malŝveli = shrink

vigili = keep watch ≠ maldormi = remain awake

aspra = rough surfaced, coarse ≠ malglata = uneven

basa = having a deep voice ≠ malalta = low, short)

febla = ≠ malforta = feeble, weak

magra = emaciated; insufficient ≠ malgrasa = lean (of people, meat)

moroza = rude, surly ≠ malafabla = unkind

skoldi = scold ≠ mallaŭdi = disparage

vaka = vacant ≠ malplena = empty

absolvi = malkondamni^† = absolve

aperti^† = malfermi = open

disipi^† = malŝpari = waste

fini = malkomenci^† = finish

forgesi = malmemori^† = forget

hungri^† = malsati = to be hungry

kvereli = malpaci^† = quarrel, feud

mava^† = malbona = bad

men^† = malpli = less

minca^† = maldika = slim

morgaŭ = malhieraŭ^† = tomorrow

morto = malvivo^† = death

pasiva = malaktiva^† = passive

*-The element soft- seems to be getting a new (and different!) lease on life in the computer Anglicism softvaro = “software,” sometimes simply called softo.

pita^† = malgranda = little

poka^† = malmulta = little, few

*softa^† = mallaŭta = soft (not loud)

sor^† = supren = upward

streta^† = mallarĝa = narrow

stupida^† = malsaĝega = foolish

vanui^† = malaperi = to vanish

The word ne = “no, not” is sometimes used as a prefix to negate the idea of the root without reversing it.

This provides a way of negating roots that do not have clear opposites:

Formations with ne- and mal- do not necessarily have exact equivalents in English, partly because English tends to allow only one kind of negating prefix with any root:

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mis-
The prefix mis- suggests the malfunction of whatever is indicated by the root:

pra-
The prefix pra- refers to antiquity and primordiality:

re-
The prefix re- shows (1) repetition or (2) restoration to a previous state.

Ni vizitis ŝin en la malliberejo kaj revizitis ŝin post ŝia liberiĝo.
= We visited her in jail and visited her again after she got out.

Foje Daĉjeto sukcesis mem laĉi la ŝuojn. Refoje li penis malsukcese.
= Once little Davey succeeded in tying his shoes himself. He tried again without success.

Ne laŭdu lian kanton ĉar li eble rekantos ĝin!
= Don’t praise his song or he may sing it again!

Ŝi kantis La Himnon kaj ĝin rekantis kaj rerekantis kaj ree rerekantis ĝis forfuĝis ĉiuj krokodiloj.
= She sang The Anthem and sang it again and again and yet again until all the non-Esperantists had fled.

Diego neniam redonis mian libron.
= Diego never gave back my book.

Ili penis resaniĝi per oleo de serpento.
= They tried to get well again using snake oil.

Esperanto min rejunigis kaj nun mi varbas senĉese.
= Esperanto rejuvenated me and now I recruit people non-stop.

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13.2. Suffixes

-aĉ-
The suffix -aĉ- is disparaging and indicates that something is of poor quality:

See usage note under fi-.

-ad-
The suffix -ad- stresses the duration of an action. The prefix ek- stresses its beginning:

Sometimes a root with the ending -o names an action. In that case, the addition of -ad- emphasizes that the action is continuous:

At other times a root with the ending -o names a non-action, such as an instrument, or the result of an action. In that case, the addition of -ad- is necessary to show that the action itself, not the instrument or result, is intended.

*-In the case of desegn-, the root is a verb, and the -o ending ought to name the action, but usage has evolved to include desegno for the design itself. Accordingly the -ad- is necessary if you want to be clear about “designing” and -aĵ- is necessary to be clear about “a design.” Most roots take one or the other, but don't need both.

Excessive use of -ad- (like any other excess) is clumsy style, but if you are not sure whether the stem is basically verbal or not —does desegno mean “a drawing” or “the act of drawing”?— then the -ad- ensures that you have an action form.*

(For more on komb- and bros-, see Part II.)

-aĵ-
The suffix -aĵ- normally signifies a concrete object or product associated with the root, an external manifestation of it, or a behavioral manifestation of it. It is also used to derive the term for a kind of meat from the name of the animal from which it comes.

*-In practice there is some overlap between -an- and -ist- in this third sense. A Christian is normally a kristano, but a Marxist is usually a marksisto, and a Buddhist is sometimes a budhano and sometimes a budhisto. The choice seems to be dictated in part by prior usage in European languages with similar suffixes (such as English). Similarly it is usual to speak of kristanismo = “Christianity” but of marksismo = “Marxism” and budhismo (not budhanismo) = “Buddhism.” If you follow your English instincts your usage should be inconspicuous, but be prepared for different (perhaps more logical) usage from speakers with different instincts.

-an-
The suffix -an- refers to (1) a member of a group, (2) an inhabitant of a country or other place, or (3) a follower of a person, philosophy, or religion.*

Contrast -an- with -ist- and -ul-. Note that, in general (but not always) -an- is attached to noun roots, -ist- to verb roots, and -ul- to adjective or verb roots, but it is the sense that matters.

See also -uj-. For more on place names, see that part of the section on nouns.

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-ar-
The suffix -ar- indicates a group of whatever is designated by the root:

-ĉj- and -nj-
Nicknames are formed in Esperanto by means of -ĉj- for males and -nj- for females (plus the -o that signals a noun). These suffixes may be attached to any fragment of the whole name, so long as the result is reasonably pronounceable:

Manjo fine ĉesis sakri en Volapuko. = Maggie finally quit cursing in Volapük.

Daĉjeto ĉiam faligas la saŭcon sur sian pantalonon. = Little Davey always dumps the gravy on his trousers.

Zamĉjo, ni amas vin! = Zammy, we love you!

The forms -ĉj- and -nj- can also be used with other words, typically kinship terms:

-ebl-
The suffix -ebl- indicates that the root, normally a transitive verb, can be applied; that is, it shows the possibility of a thing happening:

See also -iv- in the section on pseudo-affixes.

-ec-
The suffix -ec- refers to an abstract quality, trait, attribute, or essence associated with the root:

In cases where an adjectival root is used as a noun by adding -o, the noun is already abstract, so the -ec- is largely redundant and is sometimes omitted:

*-Some speakers attempt to contrast the use of -ec- in such cases to refer to the “quality” of the root as against the absence of -ec- referring to its “abstraction.” The distinction has never made much sense to me, and so far I have never heard a sentence actually spoken in ordinary conversation where it made any difference. Most speakers seem to include the -ec- most of the time.

There was a time when omitting the redundant -ec- was considered elegant in a spare kind of way. My impression is that it is today more common to include it.*

When the root shows the material of which something is made, -eca refers to a similar but different material:

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-eg-
The suffix -eg- is the opposite of -et- and increases the size or strength of the root:

-em-
The suffix -em- indicates a tendency toward what the root expresses:

Li forgesas la ŝuojn denove! = He’s forgetting his shoes again!

Li forgesemas la ŝuojn. = He tends to forget his shoes.

-end-
The suffix -end- means “necessary” or “must”:

La afero estas aranĝenda aŭ ni pereos.
= The matter must be taken care of or we shall perish.

La libro estas studenda por ĉiu komencanto.
= The book is to be studied by every beginner.

Note the contrast between the suffixes -ind- = “worth doing” and -end- = “needing doing”:

Tiuj pomoj estas manĝendaj. = Those apples need eating.

Mi nun scias, ke mia edzo ne estas aminda.
= Now I know that my husband is not worth loving.

Sed ĉar li estas via edzo, li estas amenda.
= But since he is your husband he must be loved.

Feliĉe li estas amebla. = Fortunately, he’s lovable.

-er-
The suffix -er- indicates a single element of what is designated by the root. (Often the root refers to a mass of something not normally countable.)

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-estr-
The suffix -estr- means “chief of.”

These terms tend to be used for clubs and associations, including Esperanto clubs. A government, however, is registaro from regi = “to govern.”

-et-
The suffix -et- diminishes the size or strength of the root. It is commonly also used as a separate word meaning small:

-ej-

The suffix -ej- refers to a place, usually a room or building. For example, a lernejo is a place where one learns, hence a school.

-foj-
The suffix -foj- is attached to numbers and corresponds to English “times”:

Ni trifoje avertis Daĉjeton, sed ankoraŭ li turmentadis la katidon.
= We warned little Davey three times, but he still kept pestering the kitten.

Although most often used as a suffix, foj- is technically a regular root, and occurs as a noun or adverb. See fojo in the list of “Potentially Troublesome Words.”

-i-
See -uj-.

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*-Historical note: With a capital letter, Ido is the name of an early XXth-century language project derived from Esperanto. It attracted considerable interest before the First World War because of its claims to be “more rational” than Esperanto, but constant reforms to make it conform to ever-shifting ideas of rationality doomed it. There are still a handful of Idists to be found, but most seem to be Esperantists who have learned Ido out of interest in the history of Esperanto.

-id-
The suffix -id- indicates offspring. As an independent word, ido means offspring.*

-ig-
The suffix -ig- is discussed at length in the section on transitive and intransitive verbs. Note also that it carries the sense of causation:

Verbs formed with -ig- are transitive, i.e., they require a direct object, whether stated or implied.

Most Esperanto verb roots are either transitive or intransitive, not both. Accordingly a common use of -ig- is to make an intransitive verb transitive:

Kiam ŝi bruligis la paperon, ĝi brulis.
= When she lit the paper, it burned.

When -ig- is added to verbal roots that are already transitive, the effect is to create a need for two direct objects:

Li skribis la leteron. = He wrote the letter.

Li skribigis ŝin. = He made her write (something).

Li skribigis la leteron. = He had the letter written (i.e., he made somebody write the letter).

Li skribigis al ŝi [= ŝin] la leteron. = He had her write the letter.

Li igis ŝin skribi la leteron. = He had her write the letter.

See also the section on Transitive and Intransitive Verbs for more details.

-iĝ-
The suffix -iĝ- carries a sense of becoming.

Verbs formed with -iĝ- are intransitive, i.e., they may not take a direct object.

Most Esperanto verbs root are either transitive or intransitive, not both. Accordingly a common use of -iĝ- is to make a transitive verb intransitive:

Kiam li komencis la feston, ĝi vere komenciĝis.
= When he started the party, it really got going.

When -iĝ- is added to a verb that is already intransitive, the resultant verb stresses the fact that the action is just beginning, and is roughly equivalent to -ek-:

See also the section on Transitive and Intransitive Verbs for more details.

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-il-
The suffix -il- names an instrument used to perform the function indicated by a verbal root:

In most cases a term made with -il- is a rather generic term, and more specific words also exist (sometimes -il- forms derived from different verbs) by which one can be more precise:

Note that -il- is not applied if the root is already the name of an instrument:

(For more on komb- and bros-, see the section on “Potentially Troublesome Words.”)

*-Usually the term junul(in)o is also treated as inherently showing sex, and one does not speak of a young woman as a junulo, but only as a junulino. The derived term junularo= “youth,” however, always includes both sexes.

-in-
The suffix -in- means “female.”

In Esperanto a noun is ambiguously neuter/neutral or male unless clearly marked female. Thus an instruisto may be a teacher of either sex and refers to a male teacher only if context makes it clear that sex is relevant; instruistino, on the other hand, can only be a female teacher. If it is desirable to specify male sex more emphatically, the adjective vira or the prefix vir- may be used, but is comparatively rare.

A number of nouns are always regarded as sex-marked, and no neutral form exists. This includes all kinship terms, the word vir(in)o, and words used as polite titles sinjor(in)o, fraŭl(in)o.*

Never does viro refer to “man” in the sense of “mankind.” The generic words for human beings are homo and persono, neither of which normally takes -in- because both stress the irrelevance of sex. “Humanity” (or “mankind”) is normally homaro.

Special Note on Titles

In Esperanto the words sinjoro, sinjorino, and fraŭlino (“Mr., “Mrs.,” and “Miss”) may be used without attached names, as in European languages generally.

Although it is possible to equate these words to “sir,” “madam,” and “miss,” they occur in this usage far more frequently in Esperanto than their equivalents do in English.

The titles are also used by some speakers with personal names, a custom that is far more limited in English usage. Thus Anna Jones can be:

This differentiation is particularly common among Japanese Esperantists, since it corresponds with usage in Japanese. In that case sinjorino Anna is less formal than sinjorino Jones, but does not risk the excessive intimacy of Anna alone:

*-It is best to try to follow the usage of the group you are with when addressing one of its members. Often more formal terms are used when addressing or sometimes when talking about an older person than when talking to or about a younger one. And some titles, like doktoro, are of course reserved to people who have received various degrees or occupy certain official positions.

Note, however, that not all speakers make the distinction. Prepare to be addressed in a variety of ways. Among Esperantists today, you will rarely make a faux pas if you reciprocate whatever usage is used on you.*

See also fraŭl(in)o in Part II.

-ind-
The suffix -ind- means worthy of:

Note the contrast between the suffixes -ind- and -end-:

Further examples can be found in the article on -end- earlier in this list.

-ing-
See -uj-.

-ism-
The suffix -ism- refers to a philosophy, ideology, or movement, just as its English equivalent does:

It can also refer to characteristic behaviors or phenomena, also exactly the way the English “-ism” does:

*-This usage is criticized by purists as too discrepant from the other meanings of -ism-. But it is very common, and even purists understand it just fine, I notice.

Finally, it can refer to a linguistic or other stylistic feature (especially turns of phrase borrowed from various languages):*

*-Idiotismo = “idiom” is in fact a borrowing from the French. However, its seemingly regular derivation from idioto = “idiot” nicely reflects the view held by most Esperanto speakers about languages full of idioms!

-ist-
The suffix -ist- refers (1) to a person professionally, expertly, or continually occupied with something, or (2) to an adherent of a particular ideology:

When the person is merely doing something rather than being involved in it as an occupation or as a point of belief, it is more common to use a participle:

Bedaŭrinde la nehaltigebla kantanto ne estis kantisto kaj ni devis lin eligi.
= Unfortunately the person who sang unstoppably was no singer and we had to throw him out.

See the entry on -an- in this list.

-nj-
See -ĉj-.

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-obl-
The suffix -obl- corresponds with the “-ble/-ple” in English words like “double,” “triple,” “quintuplet,” and so on; in other words, it refers to the multiplication of the quantity indicated by the root:

Tio estas duoble (pli) grava. = That is doubly important.

Mi jam pagis vin trioble! = I’ve already paid you thrice over!

-on-
The suffix -on- is attached to numbers to make fractions. It is exactly equivalent to attaching “1/” before a number:

Fractions are nouns and are inflected just like other nouns:

Donu al mi nur duonon de la mono.
= Give me only half of the money.

Donu al ŝi du trionojn.
= Giver her two-thirds.

La infanoj tre zorge dividis la kukon en dekduonojn.
= The children carefully divided the cake into twelfths.

La infanoj tre zorge dudekonigis la kukon.
= The children carefully divided the cake into twelfths.

-op-
The suffix -op- is attached to numbers to refer to things taken “at a time.” The essential idea is that of a collectivity containing several of the same thing:

Ili ĉiam parolas duope.
= They always both talk at once.

Kvaropiĝu, infanoj!
= Form groups of four, children!

Ili atakis min. Kiomope? Kvinope.
= They attacked me. How many at a time? Five at a time.

Nearly always, -op- is used in an adverb or adjective. It is unnecessary in a noun, since merely adding -o to the noun has the same result:

The extra “groupiness” of -opo sometimes leads to its being used in titles of small groups, despite its redundancy, especially if the name is intended to sound a little silly:

*-Caution: Since forms in -ope usually modify the verb, they usually refer to the subject. This sentence therefore would normally not mean that the jars were in groups of three.

Ili aĉetis po tri bokalojn.
= They bought three jars apiece.

Ili aĉetis bokalojn triope.
= Shopping in a group of three they bought jars. *

Kvinope ili trinkis po dek ses glasetojn da sakeo.
= The five together drank sixteen little glasses of sake apiece.

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*-Usage varies when the thing held is not actually inserted into the holder. Most often such a holder is called a tenilo = “holder”: Li aĉetis ŝildotenilon por sia aŭto. = “He bought a license-plate holder for his car.”

-uj-/-ing-/-i-
The suffixes -uj- and -ing- both are used to indicate containers. The difference is that -uj- is a container for several of whatever the root indicates, while -ing- is a container for but one, which is normally partially inserted into it:*

In addition, the suffix -uj- may be used to form the name of a tree from the name of its fruit. (This usage has become less common over the years, with the word -arbo being suffixed to the name of the fruit instead.)

Finally, -uj- is added to the name of an ethnic group to indicate the territory it occupies.

Note in this last example that Berberujo in this case does not indicate anything visible on a political map. Similarly Esperantujo is used to refer to “wherever Esperantists are to be found,” the “Esperanto milieu,” “Esperantist circles,” and the like.

Especially as an ending for showing a political state, the -uj- tends to become -i- in the usage of ever more Esperantists. It is now a bit old-fashioned to say Ĉinujo or Francujo, and one more often hears Ĉinio or Francio. (Esperantujo has held out against this trend somewhat longer, but even Esperantio is emerging as a colloquial form.)

For more on place names, see the subsection on place names in the section on nouns.

-ul-
The suffix -ul- indicates a person characterized by the root.

See also the entry on -an- in this list.

-um-
The suffix -um- has no fixed meaning. It is used to produce idiosyncratic derivatives from roots (most often nouns) when other suffixes are inappropriate to the purpose. Here are the most common ones:

One of the most significant uses of -um- is to derive the name of an article of clothing from that of a body part:

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13.3. Affixes as Roots

*-This characteristic has been used to argue that there is therefore no real difference between affixes and any other root. The counter-argument is that the affixes differ because of their specialized use as affixes and comparatively broad applicability in that function, quite aside from their standing as roots. In fact a handful of short roots tend to get used as though they were affixes. See section 13.5, below, on Prepositions and Other Roots as Affixes.

Suffixes and prefixes in Esperanto are able to act as roots to make independent words, so long as they take the necesary grammatical endings:*

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13.4. Pseudo-affixes

So-called “pseudo-affixes” in Esperanto are largely suffixes which are used in the international vocabulary of science. The scientific suffix -ol-, for example, is added to the name of a hydrocarbide to produce the name of the corresponding alcohol, as in English: metanolo = “methanol.” Similarly -oz-, which comes into scientific English as “-ous,” -ose,” or “osis,” occurs in illness terms: tuberkulozo = “tuberculosis.” In inorganic chemistry -oz- shows oxides and salts of low valence: feroza klorido = “ferrous chloride” (FeCl2). In organic chemistry it indicates a sugar-type molecule: fruktozo = “fructose.”

*-The pseudo-affixes call attention to themselves when used. Using these freely will puzzle some people and alarm others. Although a few speakers will think you are admirably avant-garde, nearly all listeners will tend to be distracted by how you are speaking rather than concentrating on what you are saying.

In addition to their use in scientific and technical contexts, a few of these international suffixes have begun to show up in everyday, colloquial Esperanto acting as though they were part of the regular suffixing system of the language. So we find -oz- used to mean “full of” whatever the root designates, and encounter expressions like birdo kantoza = “a bird filled with song.” It is beyond the scope of this book to deal with the technical vocabulary of science, but some of the more colloquial pseudo-affixes are listed here.*

-esk-
The pseudo-suffix -esk-, corresponds to the “-esque” in Franco-English words like “grotesque” or “Japanesque,” but it may be more widely applied, especially in very slangy speech.

La fromaĝo de Viskonsono ne estas svisa, sed almenaŭ sviseska.
= The cheese in Wisconsin is not Swiss, but it is at least Swiss style.

Ŝia muziko estas tre “hard-rock”-eska!
= Her music resembles hard rock.

-ik-
The pseudo-suffix -ik- appears in the names of some sciences, of which the most common are ekonomiko = “economics,” lingvistiko = “linguistics,” informatiko = “information science,” and komputiko = “computer science.” It appears to be used ever more often in new compounds, such as edukiko = “pedagogy, the study of education.” Probably few speakers are able to distinguish consistently between -ik- and the pseudo-suffix -ologio-, and it will be interesting to see if either actually evolves into general colloquial usage at the expense of the other. (The logical lingviko = “linguistics” is still rare and has by no means displaced lingvistiko, the term that probably is responsible for the start of -ik- as an increasingly colloquial suffix.)

Li studas komputikon ĉe la Universitato de Zagrebo.
= He studies computer science at the University of Zagreb.

-iv-
The pseudo-suffix -iv- is the active equivalent of the passive suffix -ebl-. When attached to a transitive verb root, -ebl- means “able to be Verb-ed,” but -iv- means “able to Verb”:

Rusaj vortoj estas neparoleblaj.
= Russian words are unpronounceable.

Tiu papago estas tre paroliva.
= That parrot is very capable of speech.

Tiu papago estas tre parolema.
= That parrot is very talkative.

Du parolivuloj ne estas tuta Esperanta klubo.
= Two people who can speak are not a whole Esperanto club.

The pseudo-suffix -iv- is in competition for colloquial status with the already colloquial root pov-, used as a suffix with the same meaning:

Even as there is something sleek, modern, and slightly daring about the use of -iv- (especially with roots which do not correspond with roots that would use the cognate suffix in other languages), so there is a homey, familiar, down-on-the-farm feel about -pov- in this usage, at least to me.

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-olog-, -ologi-
Many names of academic disciplines end in -ologio. The names of corresponding specialists end in -ologo.

Li blinde enamoriĝis al biologo.
= He fell blindly in love with a biologist.

Mi forlasis etnomuzikologion por fariĝi asekuro-vendisto.
= I abandoned ethnomusicology to become an insurance salesman.

Esperantologio kapablas interesi nur esperantologojn.
= Esperantology can be interesting only to Esperantologists.

La etnologon sorĉis la krokodil-adorantoj.
= The crocodile worshippers bewitched the ethnologist.

-oz-
The pseudo-suffix -oz- means “full of” the root:

La ĉambro estas aeroza kaj lumoza.
= The room is full of air and light.

Via argumento estas truoza.
= Your argument is full of holes.

Ŝia konto monozas, do mi ŝin amas.
= Her account is full of money, so I love her.

Konto monoza, estonteco roza.
= Account full of money, future full of roses.

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13.5. Prepositions & Other Roots as Affixes

There is a tendency for Esperanto prepositions to become prefixes to the verbs they are commonly used with, making the original object of the preposition into a direct object. Occasionally the preposition is prefixed, but the original prepositional phrase nevertheless remains intact:

Li parolis pri vi.
OR Li priparolis vin. .
(OR Li priparolis pri vi.) = He spoke about you.

Ŝi lasas al mi fari tion.
OR Ŝi lasas min fari tion.
OR Ŝi allasas min fari tion.
(OR Ŝi allasas al mi fari tion.) = She lets me do that.

A preposition can also be added (redundantly) to an already transitive verb.

Ili traktis la aferon kun siaj amikoj.
OR Ili pritraktis la aferon kun siaj amikoj.
= They discussed the matter with their friends.

Mi ne povas juĝi romanojn.
OR Mi ne povas juĝi pri romanoj.
OR Mi ne povas prijuĝi romanojn.
= I can’t judge novels.

This tendency produces a large series of colloquial derivatives of some verbs:

Although prepositions have the strongest tendency to become prefixes, this tendency also extends to a few other elements, notably the particle for = “away.” This has various effects. In most cases the result is easily visible in the translation.

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Sometimes there is no comparable English distinction.

El = “from” and pri = “about” are among the most common of the prepositions that do service as prefixes. Both can be used with their literal meanings:

In addition to their literal meanings, El = “from” and pri = “about” can each mean “thoroughly” or “completely,” adding a sense of completion or finality:

Zamenhof sometimes also used pri- to create derivative verbs with a different object, usually an object that “surrounds” or is a context for the verb without pri-:

Although most of the pri- compounds listed here are now colloquial, some others have become mere curiosities, and the device is rarely used to create new compounds today.

The preposition sub = “under” produces several rather specialized terms:

Some words are used so freely in compounding, that they are difficult to distinguish from affixes:

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