Prefixes & suffixes
157 prefixes and suffixes with their meanings and examples, plus the number prefixes, the ways English says “not”, and why in- turns into im-, il- and ir-.
Number prefixes: Latin and Greek side by side
English borrowed counting prefixes from both languages, which is why a two-wheeler is a bicycle (Latin) but a two-way choice is a dilemma (Greek). Latin sets tend to go with Latin roots and Greek with Greek, though modern coinages mix them.
| Meaning | Latin | Greek |
|---|---|---|
| one | uni- unicycle, uniform | mono-, mon- monologue, monotone |
| two | bi- bicycle, bilingual | di- dioxide, dilemma |
| three | tri- triangle, tricycle | tri- triangle, tricycle |
| four | quadr-, quadri-, quadru- quadrilateral, quadruple | tetra- tetrahedron, tetralogy |
| five | quint-, quinque- quintet, quintuplet | penta- pentagon, pentathlon |
| six | sext-, sexa- sextet, sextant | hexa- hexagon, hexameter |
| seven | sept-, septem-, septi- September, septet | hepta- heptagon, heptathlon |
| eight | oct-, octo-, octa- octopus, octagon | oct-, octo-, octa- octopus, octagon |
| nine | nona-, novem- nonagon, nonagenarian | no common prefix |
| ten | deci- decimal, decimeter | deca- decade, decagon |
| hundred | cent-, centi- century, centipede | hecto- hectare, hectometer |
| thousand | milli-, mill- millennium, millimeter | kilo- kilogram, kilometer |
| half | semi- semicircle, semifinal | hemi- hemisphere, hemicycle |
| many | multi- multiply, multimedia | poly- polygon, polyglot |
| all | omni- omnivore, omnipotent | pan-, panto- panorama, pandemic |
Negative prefixes: not, without, against
Un- is native English and goes on almost anything; in- came with Latin words and usually stays on them; a- or an- is the Greek ‘without’; non- is a plain ‘not’. That is how English ends up with unable but inability, and amoral (outside morality) next to immoral (against it).
| Prefix | Meaning | From | Examples |
|---|---|---|---|
| un- | not; the reverse of | Old English | unhappy, unable, undo |
| in-, im-, il-, ir- | not, without | Latin | inactive, incredible, impossible |
| non- | not | Latin | nonsense, nonfiction, nonstop |
| a-, an- | not, without | Greek | atypical, amoral, anonymous |
| dis-, dif- | apart, away; not, the opposite of | Latin | disagree, dissect, disappear |
| anti-, ant- | against, opposite of | Greek | antibiotic, antisocial, antidote |
| contra-, contro-, counter- | against, opposite | Latin | contradict, contrary, controversy |
| mis- | wrongly, badly | Old English | misspell, mistake, misunderstand |
| de- | down, away, off; reverse or remove | Latin | descend, deflate, detach |
| mal-, male- | bad, badly | Latin | malfunction, malnutrition, malevolent |
Assimilation: why in- becomes im-, il- and ir-
Many Latin prefixes end in a consonant that changed to match the next sound, which made words easier to say: in + possible became impossible, ad + tract became attract. The prefix is the same; only its last letter moved. Spotting this helps with spelling double letters: accommodate, immediate and irregular each double a consonant at the join.
| Spelling | Before | Examples |
|---|---|---|
| im- | b, m, p | imbalance immature impossible |
| il- | l | illegal illogical illiterate |
| ir- | r | irregular irresponsible irrational |
| in- | other letters | inactive incredible invisible |
| Spelling | Before | Examples |
|---|---|---|
| im- | b, m, p | immigrate import imbibe |
| il- | l | illuminate illustrate |
| ir- | r | irrigate irradiate |
| in- | other letters | include inject inspect |
| Spelling | Before | Examples |
|---|---|---|
| com- | b, m, p | combine commit compose |
| col- | l | collect collapse |
| cor- | r | correspond correct |
| co- | vowels and h | cooperate coexist cohere |
| con- | other letters | connect construct contain |
| Spelling | Before | Examples |
|---|---|---|
| ac- | c, q | accept acquire |
| af- | f | affix affirm |
| ag- | g | aggressive aggregate |
| al- | l | allocate allude |
| an- | n | annex announce |
| ap- | p | appoint apply |
| ar- | r | arrive arrogant |
| as- | s | assist assume |
| at- | t | attract attend |
| a- | sc, sp, st | ascend aspire |
| ad- | other letters | adhere adjacent advocate |
| Spelling | Before | Examples |
|---|---|---|
| e- | b, d, g, j, l, m, n, r, v | emit eject evade |
| ef- | f | effect efficient |
| ex- | vowels, c, p, t and others | exit export extract |
| Spelling | Before | Examples |
|---|---|---|
| oc- | c | occur occasion |
| of- | f | offend offer |
| op- | p | oppose oppress |
| ob- | other letters | object obstruct obtain |
| Spelling | Before | Examples |
|---|---|---|
| suc- | c | succeed |
| suf- | f | suffix suffocate |
| sug- | g | suggest |
| sup- | p | support suppress |
| sur- | r | surrogate |
| sus- | c, p, t | suspend sustain |
| sub- | other letters | submarine submit subtract |
| Spelling | Before | Examples |
|---|---|---|
| sym- | b, m, p | symbol symmetry sympathy |
| syl- | l | syllable |
| sy- | s plus a consonant | system |
| syn- | other letters | synonym synthesis synchronize |
| Spelling | Before | Examples |
|---|---|---|
| dif- | f | differ diffuse |
| di- | some consonants such as l, v | dilute divert |
| dis- | other letters | disagree dismiss dissect |
All prefixes & suffixes
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a-, an- prefix · Not & against
not, without
[Greek ἀ- (a-), ἀν- (an-) ‘not, without’]
atypical · amoral · anonymous · anarchy · apathy
Wiktionary: a-, an-ab-, abs- prefix · Place & direction
away, from
[Latin ab ‘away from’]
absent · abduct · abnormal · abstract · avert
Wiktionary: ab-, abs--able, -ible suffix · Makes adjectives
able to be, worth being
[Latin -ābilis, -ibilis, through French]
readable · comfortable · incredible · visible · flexible
Wiktionary: -able, -iblead- (ac-, af-, ag-, al-, an-, ap-, ar-, as-, at-) prefix · Place & direction
to, toward
[Latin ad ‘to, toward’]
adhere · accept · affix · allocate · attract
Wiktionary: ad- (ac-, af-, ag-, al-, an-, ap-, ar-, as-, at-)-al suffix · Makes adjectives
relating to; the act of
[Latin -ālis]
natural · musical · personal · arrival · refusal
Wiktionary: -alambi- prefix · Place & direction
both, around
[Latin ambi- ‘around, on both sides’]
ambiguous · ambidextrous · ambivalent · ambient
Wiktionary: ambi-amphi- prefix · Place & direction
both kinds, on both sides, around
[Greek ἀμφί (amphí) ‘on both sides, around’]
amphibian · amphitheater · amphibious
Wiktionary: amphi-ana- prefix · Place & direction
up, back, again
[Greek ἀνά (aná) ‘up, back, again’]
analysis · anatomy · anachronism · anagram
Wiktionary: ana--ance, -ence, -ancy, -ency suffix · Makes nouns
state, quality or action
[Latin -antia, -entia, through French]
performance · independence · assistance · existence · fluency
Wiktionary: -ance, -ence, -ancy, -encyante- prefix · Time & order
before
[Latin ante ‘before’]
antecedent · anteroom · antedate · antebellum
Wiktionary: ante--ant, -ent suffix · Makes words for people
doing; a person or thing that does
[Latin present participle -āns, -ēns (-antem, -entem)]
assistant · servant · student · resident · different
Wiktionary: -ant, -entanti-, ant- prefix · Not & against
against, opposite of
[Greek ἀντί (antí) ‘against, opposite’]
antibiotic · antisocial · antidote · antonym · antacid
Wiktionary: anti-, ant-apo- prefix · Place & direction
away from, off
[Greek ἀπό (apó) ‘away from’]
apology · apostrophe · apostle · apogee
Wiktionary: apo--ar suffix · Makes adjectives
relating to, like
[Latin -āris]
solar · lunar · circular · muscular · popular
Wiktionary: -ar-arium, -orium suffix · Makes nouns
a place for
[Latin -ārium, -ōrium]
aquarium · auditorium · planetarium · sanatorium
Wiktionary: -arium, -orium-ary suffix · Makes adjectives
relating to; a place or collection
[Latin -ārius, -ārium]
library · dictionary · primary · documentary · solitary
Wiktionary: -ary-ate suffix · Makes verbs
to make or act on; having, full of
[Latin -ātus, past participle ending of verbs in -āre]
activate · celebrate · fortunate · passionate · separate
Wiktionary: -ate-ation, -ition suffix · Makes nouns
the act, process or result of
[Latin -ātiō, -ātiōnis]
creation · transportation · imagination · competition
Wiktionary: -ation, -itionauto- prefix · Manner & quality
self, by itself
[Greek αὐτός (autós) ‘self’]
automatic · autobiography · autograph · autonomy
Wiktionary: auto-be- prefix · Manner & quality
thoroughly; to make or treat as
[Old English be- (from bī ‘by, near’)]
befriend · belittle · bewitch · becalm
Wiktionary: be-bene- prefix · Manner & quality
well, good
[Latin bene ‘well’]
benefit · benevolent · benediction · beneficial
Wiktionary: bene-bi- prefix · Number
two, twice
[Latin bi- ‘twice, double’ (from bis)]
bicycle · bilingual · binoculars · bisect · biannual
Wiktionary: bi-cata-, cat- prefix · Place & direction
down, against, completely
[Greek κατά (katá) ‘down’]
catastrophe · catalog · catapult · cataract · cathode
Wiktionary: cata-, cat-cent-, centi- prefix · Number
hundred; one hundredth
[Latin centum ‘hundred’]
century · centipede · centimeter · percent · centennial
Wiktionary: cent-, centi--cide suffix · Science & fields of study
killing; killer
[Latin -cīda, -cīdium, from caedere ‘to kill’]
pesticide · homicide · insecticide · genocide
Wiktionary: -cidecircum- prefix · Place & direction
around
[Latin circum ‘around’]
circumference · circumnavigate · circumstance · circumvent
Wiktionary: circum--cle, -cule suffix · Makes nouns
small
[Latin -culus, -cula, -culum]
particle · molecule · minuscule · corpuscle
Wiktionary: -cle, -culecom-, con-, col-, cor-, co- prefix · Together & apart
with, together; thoroughly
[Latin cum ‘with’ (com- and con- in compounds)]
combine · connect · collect · correspond · cooperate
Wiktionary: com-, con-, col-, cor-, co-contra-, contro-, counter- prefix · Not & against
against, opposite
[Latin contrā ‘against’ (counter- through French)]
contradict · contrary · controversy · counteract
Wiktionary: contra-, contro-, counter--cracy, -crat suffix · Science & fields of study
rule, government; one who rules or supports a kind of rule
[Greek -κρατία (-kratía), from κράτος (krátos) ‘power, rule’]
democracy · aristocracy · autocracy · bureaucrat · democrat
Wiktionary: -cracy, -cratde- prefix · Place & direction
down, away, off; reverse or remove
[Latin dē ‘down from, away’]
descend · deflate · detach · decode · deduct
Wiktionary: de-deca- prefix · Number
ten
[Greek δέκα (déka) ‘ten’]
decade · decagon · decathlon · decapod
Wiktionary: deca-deci- prefix · Number
one tenth; ten
[Latin decimus ‘tenth’, decem ‘ten’]
decimal · decimeter · decibel · decimate
Wiktionary: deci-di- prefix · Number
two, double
[Greek δι- (di-), from δίς (dís) ‘twice’]
dioxide · dilemma · diphthong · dipole
Wiktionary: di-dia- prefix · Place & direction
through, across, apart
[Greek διά (diá) ‘through’]
diagonal · diameter · dialogue · diagnosis · diorama
Wiktionary: dia-dis-, dif- prefix · Not & against
apart, away; not, the opposite of
[Latin dis- ‘apart, asunder’]
disagree · dissect · disappear · differ · dismiss
Wiktionary: dis-, dif--dom suffix · Makes nouns
state, condition; realm
[Old English -dōm]
kingdom · freedom · wisdom · boredom
Wiktionary: -domdys- prefix · Manner & quality
bad, difficult, abnormal
[Greek δυσ- (dus-) ‘bad, hard’]
dysfunction · dyslexia · dystopia · dyspepsia
Wiktionary: dys--ectomy suffix · Science & fields of study
surgical removal
[Greek ἐκτομή (ektomḗ) ‘a cutting out’]
appendectomy · tonsillectomy · mastectomy
Wiktionary: -ectomy-ee suffix · Makes words for people
a person who receives or undergoes
[French -é, from Latin -ātus]
employee · trainee · refugee · nominee
Wiktionary: -eeendo- prefix · Place & direction
within, inside
[Greek ἔνδον (éndon) ‘within’]
endoscope · endocrine · endothermic · endoskeleton
Wiktionary: endo-en-, em- prefix · Manner & quality
to put into; to make, cause to be
[Latin in- ‘in, into’, through French en-]
enable · enclose · encourage · empower · embrace
Wiktionary: en-, em-en-, em- (Greek) prefix · Place & direction
in, within
[Greek ἐν (en) ‘in’]
energy · empathy · emphasis · enthusiasm
Wiktionary: en-, em- (Greek)epi-, ep- prefix · Place & direction
on, upon, over, after
[Greek ἐπί (epí) ‘upon, over’]
epidermis · epidemic · epilogue · epicenter · epitaph
Wiktionary: epi-, ep--escent, -escence suffix · Makes adjectives
becoming, beginning to be
[Latin -ēscēns, present participle of verbs in -ēscere]
adolescent · fluorescent · effervescent · convalescent
Wiktionary: -escent, -escence-esque suffix · Makes adjectives
in the style of
[French -esque, from Italian -esco]
picturesque · statuesque · Kafkaesque
Wiktionary: -esqueeu- prefix · Manner & quality
good, well
[Greek εὖ (eû) ‘well’]
euphoria · eulogy · euphemism · euthanasia
Wiktionary: eu-ex-, e-, ef- prefix · Place & direction
out, out of; former
[Latin ex ‘out of’ (ē- before some consonants)]
exit · export · extract · eject · effect
Wiktionary: ex-, e-, ef-exo- prefix · Place & direction
outside, outer
[Greek ἔξω (éxō) ‘outside’]
exoskeleton · exotic · exothermic · exosphere
Wiktionary: exo-extra- prefix · Place & direction
outside, beyond
[Latin extrā ‘outside’]
extraordinary · extraterrestrial · extracurricular · extravagant
Wiktionary: extra-fore- prefix · Time & order
before, in front
[Old English fore ‘before’]
forecast · forehead · foresee · foreword
Wiktionary: fore--ful suffix · Makes adjectives
full of; the amount that fills
[Old English -full]
hopeful · careful · wonderful · spoonful
Wiktionary: -ful-fy, -ify suffix · Makes verbs
to make, to become
[Latin -ficāre, from facere ‘to make’, through French -fier]
simplify · magnify · clarify · purify · terrify
Wiktionary: -fy, -ify-graphy suffix · Science & fields of study
writing, recording or describing; a field of study
[Greek -γραφία (-graphía), from γράφειν (gráphein) ‘to write’]
biography · geography · photography · calligraphy
Wiktionary: -graphyhecto- prefix · Number
hundred
[Greek ἑκατόν (hekatón) ‘hundred’, through French]
hectare · hectometer · hectopascal
Wiktionary: hecto-hemi- prefix · Number
half
[Greek ἡμι- (hēmi-) ‘half’]
hemisphere · hemicycle · hemiplegia
Wiktionary: hemi-hepta- prefix · Number
seven
[Greek ἑπτά (heptá) ‘seven’]
heptagon · heptathlon · heptameter
Wiktionary: hepta-hetero- prefix · Manner & quality
other, different
[Greek ἕτερος (héteros) ‘other’]
heterogeneous · heteronym · heterodox
Wiktionary: hetero-hexa- prefix · Number
six
[Greek ἕξ (héx) ‘six’]
hexagon · hexameter · hexapod
Wiktionary: hexa-homo-, homeo- prefix · Manner & quality
same, alike
[Greek ὁμός (homós) ‘same’]
homogeneous · homonym · homophone · homograph
Wiktionary: homo-, homeo--hood suffix · Makes nouns
state or time of being
[Old English -hād ‘state, rank’]
childhood · neighborhood · adulthood · brotherhood
Wiktionary: -hoodhyper- prefix · Size & degree
over, above, beyond, too much
[Greek ὑπέρ (hupér) ‘over, beyond’]
hyperactive · hyperbole · hypertension · hyperventilate
Wiktionary: hyper-hypo-, hyp- prefix · Size & degree
under, below, less than normal
[Greek ὑπό (hupó) ‘under’]
hypothermia · hypodermic · hypothesis · hyphen
Wiktionary: hypo-, hyp--ia suffix · Science & fields of study
condition, state; place
[Greek and Latin -ia, a noun ending]
insomnia · nostalgia · anemia · utopia
Wiktionary: -ia-ian, -ician, -arian suffix · Makes words for people
relating to; a person skilled in
[Latin -iānus]
musician · librarian · historian · pediatrician
Wiktionary: -ian, -ician, -arian-ic, -ical suffix · Makes adjectives
relating to, characteristic of
[Greek -ικός (-ikós), Latin -icus]
historic · athletic · poetic · scientific · musical
Wiktionary: -ic, -ical-ics suffix · Science & fields of study
a field of study or practice
[Greek -ικά (-iká), plural of -ικός]
physics · economics · athletics · politics
Wiktionary: -ics-id suffix · Makes adjectives
having a quality, in a state
[Latin -idus]
vivid · rapid · fluid · lucid · timid
Wiktionary: -id-ile suffix · Makes adjectives
able to; relating to
[Latin -ilis]
fragile · mobile · juvenile · docile · tactile
Wiktionary: -ile-ine suffix · Makes adjectives
relating to, like
[Latin -īnus]
canine · feline · marine · equine
Wiktionary: -ineinfra- prefix · Place & direction
below, beneath
[Latin īnfrā ‘below’]
infrared · infrastructure · infrasound
Wiktionary: infra-in-, im-, il-, ir- (into) prefix · Place & direction
in, into, on, toward
[Latin in ‘in, into’]
include · inject · import · illuminate · irrigate
Wiktionary: in-, im-, il-, ir- (into)in-, im-, il-, ir- (not) prefix · Not & against
not, without
[Latin in- ‘not, un-’]
inactive · incredible · impossible · illegal · irregular
Wiktionary: in-, im-, il-, ir- (not)inter- prefix · Place & direction
between, among
[Latin inter ‘between’]
international · interrupt · intersect · interval
Wiktionary: inter-intra-, intro- prefix · Place & direction
within, inward
[Latin intrā ‘within’, intrō ‘inwardly’]
intravenous · intramural · introvert · introduce
Wiktionary: intra-, intro--ion, -tion, -sion suffix · Makes nouns
the act, process or result of
[Latin -iō, -iōnis]
action · decision · invention · mission · union
Wiktionary: -ion, -tion, -sion-ish suffix · Makes adjectives
somewhat; like; of a nation
[Old English -isc]
childish · reddish · foolish · English
Wiktionary: -ish-ism suffix · Makes nouns
belief, practice or condition
[Greek -ισμός (-ismós), through Latin and French]
heroism · criticism · realism · tourism · magnetism
Wiktionary: -ism-ist suffix · Makes words for people
a person who does, practises or believes
[Greek -ιστής (-istḗs), through Latin and French]
artist · dentist · pianist · scientist · cyclist
Wiktionary: -ist-itis suffix · Science & fields of study
inflammation of
[Greek -ῖτις (-îtis)]
arthritis · tonsillitis · bronchitis · appendicitis
Wiktionary: -itis-ity suffix · Makes nouns
state or quality of
[Latin -itās, -itātis, through French -ité]
ability · curiosity · equality · reality · variety
Wiktionary: -ity-ive, -ative, -itive suffix · Makes adjectives
tending to, doing
[Latin -īvus, through French -if]
active · creative · talkative · expensive · sensitive
Wiktionary: -ive, -ative, -itive-ize, -ise suffix · Makes verbs
to make, to become, to do
[Greek -ίζειν (-ízein), through Latin -izāre]
realize · modernize · criticize · organize · sympathize
Wiktionary: -ize, -isekilo- prefix · Number
thousand
[Greek χίλιοι (khílioi) ‘thousand’, through French]
kilogram · kilometer · kilowatt · kilobyte
Wiktionary: kilo--less suffix · Makes adjectives
without
[Old English -lēas ‘free from, without’]
careless · hopeless · homeless · endless
Wiktionary: -less-logy, -ology suffix · Science & fields of study
study of, science of; speech
[Greek -λογία (-logía), from λόγος (lógos) ‘word, reason’]
biology · geology · psychology · zoology · technology
Wiktionary: -logy, -ology-ly suffix · Makes adverbs
in a certain way; like, every
[Old English -līċe, -līċ ‘like’]
quickly · slowly · friendly · weekly
Wiktionary: -lymacro- prefix · Size & degree
large, long
[Greek μακρός (makrós) ‘long, large’]
macroeconomics · macrocosm · macroscopic
Wiktionary: macro-mal-, male- prefix · Manner & quality
bad, badly
[Latin male ‘badly’, malus ‘bad’ (through French mal)]
malfunction · malnutrition · malevolent · malediction
Wiktionary: mal-, male--mania, -maniac suffix · Science & fields of study
madness; extreme enthusiasm
[Greek μανία (manía) ‘madness’]
kleptomania · pyromaniac · megalomania
Wiktionary: -mania, -maniacmega-, megalo- prefix · Size & degree
large, great; one million
[Greek μέγας (mégas) ‘great’]
megaphone · megabyte · megalith · megawatt
Wiktionary: mega-, megalo--ment suffix · Makes nouns
the action, result or means of
[Latin -mentum, through French]
government · movement · payment · statement · enjoyment
Wiktionary: -mentmeso- prefix · Place & direction
middle
[Greek μέσος (mésos) ‘middle’]
Mesopotamia · mesosphere · Mesozoic
Wiktionary: meso-meta-, met- prefix · Manner & quality
after, beyond; change
[Greek μετά (metá) ‘after, beyond, with’]
metaphor · metamorphosis · metabolism · metaphysics
Wiktionary: meta-, met-micro- prefix · Size & degree
small
[Greek μικρός (mikrós) ‘small’]
microscope · microphone · microbe · microwave
Wiktionary: micro-milli-, mill- prefix · Number
thousand; one thousandth
[Latin mīlle ‘thousand’]
millennium · millimeter · million · millipede
Wiktionary: milli-, mill-miso-, mis- (hatred) prefix · Manner & quality
hatred, dislike
[Greek μισέω (miséō) ‘to hate’, μῖσος (mîsos) ‘hatred’]
misanthrope · misogyny · misology
Wiktionary: miso-, mis- (hatred)mis- (wrongly) prefix · Not & against
wrongly, badly
[Old English mis- ‘wrongly’]
misspell · mistake · misunderstand · mislead
Wiktionary: mis- (wrongly)mono-, mon- prefix · Number
one, single, alone
[Greek μόνος (mónos) ‘alone, single’]
monologue · monotone · monopoly · monarch · monorail
Wiktionary: mono-, mon--mony suffix · Makes nouns
state, condition or result
[Latin -mōnia, -mōnium]
matrimony · testimony · parsimony · acrimony
Wiktionary: -monymulti- prefix · Size & degree
many
[Latin multus ‘much, many’]
multiply · multimedia · multicolored · multitude
Wiktionary: multi-neo- prefix · Time & order
new
[Greek νέος (néos) ‘new’]
neologism · neonatal · neoclassical · neophyte
Wiktionary: neo--ness suffix · Makes nouns
state or quality of being
[Old English -nes, -nis]
kindness · happiness · darkness · fitness
Wiktionary: -nessnon- prefix · Not & against
not
[Latin nōn ‘not’]
nonsense · nonfiction · nonstop · nonprofit
Wiktionary: non-nona-, novem- prefix · Number
nine
[Latin nōnus ‘ninth’, novem ‘nine’]
nonagon · nonagenarian · November
Wiktionary: nona-, novem-ob- (oc-, of-, op-) prefix · Place & direction
toward, against, in the way
[Latin ob ‘toward, against’]
object · obstruct · occur · offend · oppose
Wiktionary: ob- (oc-, of-, op-)oct-, octo-, octa- prefix · Number
eight
[Latin octō, Greek ὀκτώ (oktṓ) ‘eight’]
octopus · octagon · October · octave · octet
Wiktionary: oct-, octo-, octa--oid suffix · Makes adjectives
like, resembling
[Greek -ειδής (-eidḗs) ‘-like’, from εἶδος (eîdos) ‘form’]
android · asteroid · humanoid · spheroid
Wiktionary: -oidomni- prefix · Size & degree
all, every
[Latin omnis ‘all’]
omnivore · omnipotent · omniscient · omnipresent
Wiktionary: omni--or suffix · Makes words for people
a person or thing that does
[Latin -or, -tor, -sor]
actor · inventor · spectator · elevator · conductor
Wiktionary: -or-ory suffix · Makes adjectives
relating to; a place for
[Latin -ōrius, -ōrium]
laboratory · dormitory · observatory · sensory · memory
Wiktionary: -ory-osis, -sis suffix · Science & fields of study
a process, action or condition
[Greek -ωσις (-ōsis), -σις (-sis)]
diagnosis · hypnosis · metamorphosis · analysis · synthesis
Wiktionary: -osis, -sis-ous, -ious, -ose suffix · Makes adjectives
full of, having
[Latin -ōsus, through French -eux]
famous · dangerous · curious · generous · verbose
Wiktionary: -ous, -ious, -oseout- prefix · Place & direction
outside; more or better than
[Old English ūt ‘out’]
outrun · outlive · outdoor · outnumber
Wiktionary: out-over- prefix · Size & degree
above; too much
[Old English ofer ‘over’]
overcook · overflow · overlook · overcome
Wiktionary: over-pan-, panto- prefix · Size & degree
all, every
[Greek πᾶς (pâs), neuter πᾶν (pân) ‘all’]
panorama · pandemic · panacea · pantheon
Wiktionary: pan-, panto-para-, par- prefix · Place & direction
beside, alongside; beyond
[Greek παρά (pará) ‘beside’]
paragraph · parallel · paradox · parasite · parody
Wiktionary: para-, par-pen-, pene- prefix · Size & degree
almost
[Latin paene ‘almost’]
peninsula · penultimate · penumbra
Wiktionary: pen-, pene-penta- prefix · Number
five
[Greek πέντε (pénte) ‘five’]
pentagon · pentathlon · pentameter
Wiktionary: penta-per- prefix · Place & direction
through, thoroughly
[Latin per ‘through’]
perfect · perforate · permit · persist · perennial
Wiktionary: per-peri- prefix · Place & direction
around, near
[Greek περί (perí) ‘around’]
perimeter · periscope · period · peripheral
Wiktionary: peri--phobia, -phobe suffix · Science & fields of study
fear or strong dislike of
[Greek -φοβία (-phobía), from φόβος (phóbos) ‘fear’]
claustrophobia · arachnophobia · xenophobia · technophobe
Wiktionary: -phobia, -phobepoly- prefix · Size & degree
many
[Greek πολύς (polús) ‘much, many’]
polygon · polyglot · polymer · polytheism
Wiktionary: poly-post- prefix · Time & order
after, behind
[Latin post ‘after, behind’]
postpone · postscript · postwar · posterior
Wiktionary: post-pre- prefix · Time & order
before, in front
[Latin prae ‘before’]
preview · predict · prepare · prefix · precede
Wiktionary: pre-pro- (before) prefix · Time & order
before, in front
[Greek πρό (pró) ‘before’]
prologue · prophet · problem · program
Wiktionary: pro- (before)pro- (forward) prefix · Place & direction
forward, forth; in favor of
[Latin prō ‘forward, for’]
proceed · produce · promote · project · propel
Wiktionary: pro- (forward)proto-, prot- prefix · Time & order
first, earliest
[Greek πρῶτος (prôtos) ‘first’]
prototype · protocol · protagonist · proton
Wiktionary: proto-, prot-pseudo- prefix · Manner & quality
false, fake
[Greek ψευδής (pseudḗs) ‘false’]
pseudonym · pseudoscience · pseudopod
Wiktionary: pseudo-quadr-, quadri-, quadru- prefix · Number
four
[Latin quattuor ‘four’ (quadri- in compounds)]
quadrilateral · quadruple · quadrant · quadrangle
Wiktionary: quadr-, quadri-, quadru-quint-, quinque- prefix · Number
five
[Latin quīntus ‘fifth’, quīnque ‘five’]
quintet · quintuplet · quintessence
Wiktionary: quint-, quinque-re-, red- prefix · Time & order
again; back
[Latin re- ‘again, back’]
return · rebuild · react · reject · revise
Wiktionary: re-, red-retro- prefix · Time & order
backward, back in time
[Latin retrō ‘backward’]
retrospect · retroactive · retrograde · retrofit
Wiktionary: retro-se- prefix · Together & apart
apart, aside
[Latin sē- ‘apart, without’]
separate · secede · secure · select · seclude
Wiktionary: se-semi- prefix · Number
half, partly
[Latin sēmi- ‘half’]
semicircle · semifinal · semiconductor · semicolon
Wiktionary: semi-sept-, septem-, septi- prefix · Number
seven
[Latin septem ‘seven’]
September · septet · septuagenarian
Wiktionary: sept-, septem-, septi-sext-, sexa- prefix · Number
six
[Latin sex ‘six’, sextus ‘sixth’]
sextet · sextant · sexagenarian
Wiktionary: sext-, sexa--ship suffix · Makes nouns
state, condition or skill
[Old English -scipe]
friendship · leadership · citizenship · hardship
Wiktionary: -ship-some suffix · Makes adjectives
tending to, causing
[Old English -sum]
awesome · lonesome · troublesome · tiresome
Wiktionary: -somesub- (suc-, suf-, sug-, sup-, sur-, sus-) prefix · Place & direction
under, below; less than
[Latin sub ‘under’]
submarine · subway · succeed · suffix · support
Wiktionary: sub- (suc-, suf-, sug-, sup-, sur-, sus-)super-, supra-, sur- prefix · Place & direction
above, over, beyond
[Latin super, suprā ‘above’ (sur- through French)]
supervise · superior · supernatural · surpass · surname
Wiktionary: super-, supra-, sur-syn-, sym-, syl-, sys- prefix · Together & apart
together, with
[Greek σύν (sún) ‘with, together’]
synonym · symphony · sympathy · syllable · system
Wiktionary: syn-, sym-, syl-, sys-tele- prefix · Place & direction
far, at a distance
[Greek τῆλε (têle) ‘far off’]
telephone · television · telescope · telegraph · telepathy
Wiktionary: tele-tetra- prefix · Number
four
[Greek τέτταρες (téttares) ‘four’ (τετρα- in compounds)]
tetrahedron · tetralogy · tetrapod
Wiktionary: tetra-trans- prefix · Place & direction
across, beyond, through
[Latin trāns ‘across’]
transport · transfer · translate · transmit · transparent
Wiktionary: trans-tri- prefix · Number
three
[Latin trēs, Greek τρεῖς (treîs) ‘three’]
triangle · tricycle · trilogy · tripod · trio
Wiktionary: tri--tude, -itude suffix · Makes nouns
state or quality of
[Latin -tūdō, -tūdinis]
attitude · gratitude · solitude · magnitude · altitude
Wiktionary: -tude, -itudeultra- prefix · Size & degree
beyond, extremely
[Latin ultrā ‘beyond’]
ultraviolet · ultrasound · ultramarine
Wiktionary: ultra-un- prefix · Not & against
not; the reverse of
[Old English un- ‘not’]
unhappy · unable · undo · unlock · unbelievable
Wiktionary: un-under- prefix · Size & degree
below; too little
[Old English under ‘under’]
underground · underline · underestimate · underwater
Wiktionary: under-uni- prefix · Number
one
[Latin ūnus ‘one’]
unicycle · uniform · unicorn · unify · universe
Wiktionary: uni--ure suffix · Makes nouns
the act, process or result of
[Latin -ūra]
culture · failure · mixture · procedure · closure
Wiktionary: -urevice- prefix · Manner & quality
in place of, deputy
[Latin vice ‘in place of’]
viceroy · vice-president · vice-chancellor
Wiktionary: vice--ward, -wards suffix · Makes adverbs
in the direction of
[Old English -weard]
backward · toward · forward · homeward
Wiktionary: -ward, -wardswith- prefix · Not & against
against; back, away
[Old English wiþ ‘against’]
withdraw · withhold · withstand
Wiktionary: with--y (adjective) suffix · Makes adjectives
full of, like (forms adjectives)
[Old English -iġ]
rainy · sleepy · dusty · salty
Wiktionary: -y (adjective)-y (noun) suffix · Makes nouns
state, quality or act (forms nouns)
[Greek and Latin -ia, through French -ie]
geometry · monarchy · victory · sympathy · jealousy
Wiktionary: -y (noun)
Using the list
Search by spelling (-able, sub), by meaning (not, three, small) or by a word you want to understand (misspell). Type narrows the list to prefixes or suffixes, Language to Latin, Greek or Old English, and Kind of meaning to groups such as numbers or suffixes that make adjectives. Assimilated spellings are listed under their main prefix, so im- is found under in-.
Suffixes often tell you a word’s job: -tion and -ness make nouns, -ous and -able make adjectives, -ize and -fy make verbs. Each entry links the Wiktionary page it was checked against.
Questions
Is it un- or in-?
There is no rule that always works. Un- is the native English prefix and is used freely; in- arrived inside words borrowed from Latin or French. When in doubt, check a dictionary: unable and inability are both standard.
Why is it bicycle but dilemma?
Bi- is the Latin ‘two’ and di- the Greek one. Words built in Greek, such as dilemma, keep the Greek prefix; Latin and later English coinages, such as bicycle, mostly use the Latin one.
What does assimilation mean?
A sound becoming more like its neighbour. The n of in- turns into m before b, m and p, which are made with the lips, and copies an l or r, so in + legal became illegal.