Learn Prefix and Suffix in English Grammar with easy definitions, rules, examples, and word-building techniques. Improve your vocabulary and language skills.
Words are not random collections of letters — they are built. English borrows roots from Latin, Greek, Old French, and Old English, then extends and modifies them by attaching small, meaningful units at the beginning or end. These units are called affixes: prefixes come before the root, and suffixes come after it. Together, they form one of the most productive and systematic mechanisms for creating new words in the English language.
Understanding prefixes and suffixes allows you to decode unfamiliar words, expand your vocabulary, improve your spelling, and write with greater precision. A student who recognises that bio- means life and -ology means the study of can unlock the meaning of biology, biochemistry, biography, microbiology, and dozens of other words at once — without looking any of them up.
By the end of this chapter, you will be able to:
Language is built from units of meaning. The smallest meaningful unit in any language is called a morpheme. A single word may contain one morpheme or several. When morphemes are attached to a base word to change or extend its meaning, they are called affixes. The study of how words are built from meaningful parts is called morphology.
English has three types of affix — prefix, suffix, and infix — but only prefixes and suffixes are productive in modern English. Infixes (inserted inside the root) are rare and mostly confined to informal intensification. The focus of this chapter is on prefixes and suffixes.
Morpheme — the smallest unit of meaning in a language.
Affix — a morpheme attached to a root word to modify or extend its meaning.
Prefix — an affix added to the BEGINNING of a root word.
Suffix — an affix added to the END of a root word.
Root word — the base morpheme that carries the central meaning; also called the stem or base.
The root word (also called the stem or base) is the core unit of meaning to which affixes are attached. A root may be a complete English word in its own right (happy, play, kind), or it may be a bound form that only occurs with affixes — a fragment borrowed from Latin or Greek (-ject- as in inject, reject, project; -struct- as in construct, instruct, destruction).
The root -ject- (from Latin jacere, “to throw”) never appears alone in modern English, yet it generates a large family of words.
| Affix Type | Position | Function in English | Example |
|---|---|---|---|
| Prefix | Before the root | Changes meaning; rarely changes word class | preview |
| Suffix | After the root | Changes meaning AND often changes word class | teacher |
| Infix | Inside the root | Very rare in standard English; used for emphasis in informal speech | abso-bloomin’-lutely (informal) |
A free morpheme can stand alone as a complete word (kind, play, work). A bound morpheme cannot stand alone — it must be attached to another morpheme to have meaning. All prefixes and suffixes are bound morphemes.
| Type | Can Stand Alone? | Examples |
|---|---|---|
| Free morpheme | Yes | kind, teach, help, act, friend, usual |
| Bound morpheme (prefix) | No | un-, pre-, dis-, re-, mis-, anti- |
| Bound morpheme (suffix) | No | -ness, -ment, -tion, -ly, -ful, -ise/-ize |
| Bound morpheme (root) | No | -ject-, -struct-, -port-, -duc-, -graph- |
A prefix is a bound morpheme placed at the beginning of a root word to create a new word with a modified meaning. In almost all cases, adding a prefix does not change the word class of the root. An adjective with a prefix remains an adjective; a verb with a prefix remains a verb.
Prefix + Root = New Word (same word class, modified meaning)
un- + happy (adj.) = unhappy (adj.)
re- + write (v.) = rewrite (v.)
mis- + understand (v.) = misunderstand (v.)
dis- + honest (adj.) = dishonest (adj.)
Prefixes are attached directly to the root word, usually without a hyphen in modern English (though hyphens are used in some cases — see Section 1.4.1). The meaning of the new word is typically predictable from the prefix meaning plus the root meaning, though some combinations have become idiomatic over time.
The largest and most commonly tested group of prefixes expresses negation, reversal, or absence. Several negative prefixes overlap in meaning, but their distribution across different roots is governed by convention and etymology.
| Prefix | Meaning | Origin | Examples | Note |
|---|---|---|---|---|
| un- | not; reversal of action | Old English | unhappy, unknown, unfair, unlock, undo, unwrap, unofficial | Most productive negative prefix. Used with adjectives, adverbs, and verbs. Reversal meaning: undo, untie. |
| in- | not; into | Latin | incorrect, invisible, inefficient, insecure, incomplete | Used mainly with Latin-origin words. Assimilates to il-, im-, ir- before certain consonants. |
| il- | not | Latin (in- + l) | illegal, illegible, illogical, illiterate, illegitimate | Form of in- used before roots beginning with l. |
| im- | not; into | Latin (in- + m/p) | impossible, immature, impartial, imperfect, immobile | Form of in- used before roots beginning with m, b, or p. |
| ir- | not | Latin (in- + r) | irregular, irrelevant, irresponsible, irrational, irresistible | Form of in- used before roots beginning with r. |
| dis- | not; opposite; away | Latin | disagree, dishonest, disconnect, displace, disapprove, disorder | Often used with verbs and adjectives. Can also indicate separation (dismiss). |
| non- | not; absence of | Latin | non-fiction, non-profit, non-essential, non-verbal, non-compliance | More neutral than un- or dis-. Usually hyphenated before proper nouns. |
| mis- | wrongly; badly; not | Old English / Old French | misunderstand, mislead, miscalculate, misjudge, misinterpret | Implies incorrect action, not mere absence. Misread = read incorrectly. |
| anti- | against; opposing | Greek | antibody, anticlockwise, antisocial, antiwar, antibiotic | Implies active opposition. Hyphen often used before proper nouns and vowels. |
| counter- | against; in response to | Latin / French | counteract, counterargument, counterproductive, counterclaim | Implies action taken in opposition or response to another action. |
| de- | reversal; removal; reduction | Latin / French | defrost, deactivate, devalue, decentralise, decompose | Reversal (defrost), removal (decaffeinate), or reduction (devalue). |
un- is used mainly with native English words and participial adjectives: unclear, unwilling, unfinished, unbroken.
in-/il-/im-/ir- is used mainly with words of Latin origin: inaccurate, illogical, immoral, irresponsible.
dis- often implies active opposition or the undoing of something: disagree (to hold a contrary opinion), disconnect (to actively sever a connection).
When in doubt, check a dictionary. Do not guess the negative prefix of a Latin-origin word — the combination may not exist.
| Prefix | Meaning | Origin | Examples |
|---|---|---|---|
| uni- | one | Latin | unicorn, uniform, unify, unilateral, universe |
| mono- | one; single | Greek | monologue, monotone, monolingual, monopoly, monograph |
| bi- | two | Latin | bicycle, bilingual, biannual, binocular, bilateral |
| di- | two; double | Greek | dioxide, dilemma, dipole, diphthong, dialogue |
| tri- | three | Latin / Greek | triangle, tripod, trilogy, trilingual, tricycle |
| quad-/quart- | four | Latin | quadrant, quadrilateral, quartet, quarter |
| pent-/quint- | five | Greek / Latin | pentagon, pentathlon, quintet, quintuple |
| hex-/sex- | six | Greek / Latin | hexagon, hexameter, sextuplet |
| oct- | eight | Latin / Greek | octopus, octagon, October (8th in old Roman calendar) |
| dec-/deca- | ten | Greek / Latin | decade, decimal, decathlon, decibel |
| cent- | hundred | Latin | century, centimetre, centennial, percent |
| milli- | thousand; thousandth | Latin | millennium, millimetre, millisecond |
| mega- | large; million | Greek | megaphone, megabyte, megalopolis |
| micro- | very small; millionth | Greek | microscope, microchip, microbiology, microwave |
| macro- | large; long | Greek | macroeconomics, macroscopic, macrostructure |
| mini- | small | Latin | minibus, miniature, minimal, minimum |
| multi- | many | Latin | multilingual, multimedia, multinational, multitask |
| poly- | many | Greek | polygon, polyglot, polymer, polygraph, polynomial |
| semi- | half; partly | Latin | semicircle, semifinal, semiconductor, semicolon |
| hemi- | half | Greek | hemisphere, hemicycle |
| Prefix | Meaning | Examples |
|---|---|---|
| pre- | before | preview, predict, precede, prehistoric, preoccupy, prepay |
| post- | after | postwar, postpone, postgraduate, postscript, postdate |
| ante- | before; in front of | antecedent, antedate, anteroom, antenatal |
| fore- | before; in front | forecast, foreground, foresee, foreword, forewarn |
| re- | again; back | rewrite, return, reconsider, rebuild, reconnect, revisit |
| retro- | backward; past | retrospective, retrograde, retrofit, retroactive |
| ex- | former; out of | ex-president, ex-wife, exclude, export, exhale, extract |
| neo- | new; recent | neoclassical, neologism, neolithic, neonatal |
| proto- | first; earliest form | prototype, protocol, protozoa, protagonist |
| Prefix | Meaning | Examples |
|---|---|---|
| sub- | under; below; secondary | submarine, subway, substandard, subtitle, subdivide, subsection |
| super-/sur- | above; over; beyond | supervisor, supernatural, superhuman, surpass, surplus, surface |
| inter- | between; among | international, interact, intercept, intervene, interdependent |
| intra- | within | intranet, intracellular, intramural, intravenous |
| trans- | across; beyond; through | transport, transcontinental, transform, translate, transmit |
| pro- | forward; in favour of | project, promote, progress, pro-democracy, propose |
| circum- | around | circumference, circumstance, circumnavigate, circumvent |
| peri- | around; near | perimeter, periscope, peripheral, period |
| epi- | upon; over; near | epicentre, epidemic, episode, epilogue, epitaph |
| para- | beside; beyond; similar to | parallel, paramedic, paranormal, paraphrase, paragraph |
| infra- | below; beneath | infrastructure, infrared, infrasound |
| extra- | outside; beyond | extraordinary, extraterrestrial, extracurricular, extract |
| Prefix | Meaning | Examples |
|---|---|---|
| over- | too much; above | overload, overestimate, overcome, overreact, overpopulated |
| under- | too little; below | underestimate, underperform, underdeveloped, undermine, underfunded |
| hyper- | over; excessive; above | hyperactive, hypersensitive, hyperlink, hypertension, hyperbole |
| hypo- | under; below normal | hypothesis, hypothermia, hypoglycaemia, hypodermic |
| ultra- | beyond; extremely | ultraviolet, ultramodern, ultrasound, ultra-competitive |
| arch- | chief; principal; extreme | archbishop, archenemy, architect, archetype |
| out- | surpassing; external | outperform, outrun, outnumber, outgrow, outwit |
| Prefix | Meaning | Examples |
|---|---|---|
| auto- | self | autobiography, automatic, autonomous, autopilot, autograph |
| bio- | life | biology, biography, biochemistry, biodiversity, biometric |
| geo- | earth | geography, geology, geometry, geopolitics, geothermal |
| tele- | far; distant | telephone, television, telescope, telepathy, teleconference |
| co-/com-/con- | together; with | cooperate, collaborate, companion, convene, coordinate |
| homo- | same | homogeneous, homophone, homonym, homologous |
| hetero- | different; other | heterogeneous, heterodox, heterosexual |
| pseudo- | false; pretending to be | pseudonym, pseudoscience, pseudo-intellectual |
| en-/em- | put into; cause to be | enable, encourage, enforce, embody, empower, enclose |
| be- | make; cause; about | believe, befriend, belittle, besiege, bewilder, become |
| mal- | bad; badly; wrong | malfunction, malnutrition, malicious, malpractice, maladjusted |
| bene- | good; well | benefit, beneficial, benevolent, benefactor, benediction |
A suffix is a bound morpheme placed at the end of a root word to form a new word. Unlike prefixes, suffixes frequently change the word class (part of speech) of the root as well as its meaning. The same root can become a noun, verb, adjective, or adverb by attaching different suffixes.
Suffixes are classified primarily by the word class they produce. A suffix that creates a noun is called a nominalising suffix; one that creates a verb is a verbalising suffix; one that creates an adjective is an adjectivising suffix; and one that creates an adverb is an adverbialising suffix.
Root: act
Noun-forming suffixes are attached to verbs, adjectives, or other nouns to create new nouns. They can indicate people (agents), abstract qualities, processes, results, places, and fields of study.
| Suffix | Meaning | Base Word Class | Examples |
|---|---|---|---|
| -er / -or | one who does | Verb | teacher, writer, director, inspector, actor, supervisor |
| -ist | one who practises; believer in | Noun/Adj. | scientist, journalist, economist, violinist, optimist, socialist |
| -ian | one who specialises in; associated with | Noun/Adj. | historian, musician, librarian, technician, politician |
| -ee | one who is the recipient of an action | Verb | employee, trainee, refugee, interviewee, nominee |
| -ant / -ent | one who performs an action | Verb | applicant, consultant, assistant, student, resident, agent |
| Suffix | Meaning | Base Word Class | Examples |
|---|---|---|---|
| -ness | state or quality of | Adjective | kindness, darkness, happiness, awareness, bitterness, readiness |
| -ity / -ty | state or quality of | Adjective | ability, clarity, equality, reality, liberty, creativity, loyalty |
| -ment | action, result, or state | Verb | agreement, development, achievement, announcement, treatment |
| -tion / -sion / -ion | action, process, result | Verb | action, decision, production, revision, expansion, completion |
| -ance / -ence | state, quality, or action | Verb/Adj. | performance, reliance, difference, confidence, persistence |
| -dom | state; realm; condition | Noun/Adj. | freedom, boredom, wisdom, kingdom, serfdom, stardom |
| -hood | state; condition; period | Noun/Adj. | childhood, neighbourhood, brotherhood, adulthood, likelihood |
| -ship | status; skill; relationship | Noun | friendship, leadership, membership, scholarship, ownership |
| -age | action; result; collective | Verb/Noun | storage, breakage, passage, coverage, shortage, drainage |
| -al | action or process of | Verb | approval, refusal, arrival, proposal, withdrawal, removal |
| -ure | action; result; condition | Verb | failure, procedure, exposure, pressure, closure, departure |
| -ism | doctrine; practice; system | Noun/Adj. | capitalism, criticism, realism, terrorism, journalism, racism |
| -ery / -ry | place; collective; practice | Noun/Adj. | bakery, slavery, rivalry, machinery, bravery, poetry |
Verb-forming suffixes are added to nouns or adjectives to create verbs. They typically carry the meaning “to make,” “to become,” or “to cause to be.”
| Suffix | Meaning | Base Word Class | Examples |
|---|---|---|---|
| -ise / -ize | to make; to cause to become | Noun/Adj. | organise, modernise, realise, criticise, specialise, prioritise |
| -ify / -fy | to make; to cause to be | Noun/Adj. | clarify, justify, simplify, magnify, amplify, qualify, modify |
| -en | to make; to become | Adj./Noun | darken, soften, strengthen, widen, shorten, brighten, loosen |
| -ate | to make; to act on | Noun/Adj. | activate, facilitate, regulate, communicate, motivate, negotiate |
Both -ise and -ize are accepted in British English. -ize reflects the Greek origin (-izo) and is preferred by Oxford University Press. -ise is more common in everyday British usage. American English uses -ize almost exclusively. Whichever form you choose, be consistent.
Important exception: some words are always spelled with -ise: advertise, advise, arise, comprise, disguise, enterprise, exercise, otherwise, rise, supervise, surprise, televise. These end in -ise because the -ise is part of the root, not a suffix.
| Suffix | Meaning | Base Word Class | Examples |
|---|---|---|---|
| -ful | full of; having the quality of | Noun/Verb | careful, hopeful, powerful, peaceful, useful, grateful, harmful |
| -less | without; lacking | Noun | careless, hopeless, powerless, useless, harmless, restless, endless |
| -ous / -ious | having the quality of; full of | Noun | dangerous, famous, anxious, ambitious, furious, mysterious, generous |
| -al / -ial | relating to; of the nature of | Noun | national, cultural, financial, industrial, official, essential, royal |
| -ic / -ical | of; relating to; having the nature of | Noun | historic/historical, economic/economical, comic/comical, classic/classical |
| -ive / -ative | tending to; having the quality of | Verb/Noun | active, creative, progressive, native, informative, comparative |
| -able / -ible | capable of; worthy of | Verb/Noun | readable, agreeable, visible, credible, flexible, responsible |
| -ant / -ent | having a quality; performing an action | Verb | significant, dominant, different, efficient, dependent, convenient |
| -ary / -ory | relating to; of the nature of | Noun/Verb | primary, secondary, revolutionary, mandatory, satisfactory |
| -ish | having a tendency; somewhat; relating to | Noun/Adj. | childish, foolish, reddish, selfish, English, Scottish, greenish |
| -like | resembling; similar to | Noun | childlike, lifelike, businesslike, dreamlike, warlike |
| -ly | having the quality of (adjective only) | Noun/Adj. | friendly, lovely, scholarly, cowardly, lonely, elderly, timely |
| -ward / -wards | in the direction of | Noun | inward, outward, forward, backward, northward, onward |
The principal adverb-forming suffix in English is -ly, which attaches to adjectives to create adverbs of manner, degree, or frequency.
| Suffix | Meaning / Function | Examples | Spelling Note |
|---|---|---|---|
| -ly | in a [adjective] manner | clearly, carefully, quickly, professionally, recently, fortunately | Words ending in -le: drop -e, add -y (gentle → gently). Words ending in -y: change -y to -i + -ly (happy → happily). Words ending in -ic: add -ally (basic → basically). |
| -ward(s) | in the direction of | forward, backward, northward, inward, outward | -ward is standard in American English; -wards more common in British English. |
| -wise | in the manner of; with respect to | likewise, clockwise, otherwise, lengthwise | Avoid overuse in formal writing. |
Some words have both -ic and -ical forms with different meanings: historic (of historical significance) vs. historical (relating to history); economic (relating to the economy) vs. economical (using resources efficiently).
Both -ic and -ical adjectives form adverbs with -ally: historically, economically, basically, logically, automatically.
Exception: public → publicly (not publically, which is a common error).
| Suffix | Meaning | Examples |
|---|---|---|
| -let | small version of | booklet, droplet, hamlet, leaflet, piglet, streamlet |
| -ling | small; young; associated with | duckling, seedling, yearling, underling, hireling, foundling |
| -ette | small; female; imitation | kitchenette, novelette, cigarette, statuette, majorette |
| -kin | small (archaic/dialectal) | napkin, manikin, lambkin |
Attach the prefix directly to the root. Do not drop letters from either part.
un- + natural = unnatural | mis- + spell = misspell | dis- + satisfied = dissatisfied | over- + rate = overrate
| Rule | Condition | Examples |
|---|---|---|
| Double the consonant | When the prefix ends in the same letter the root begins with | un- + necessary = unnecessary; mis- + spell = misspell; dis- + satisfy = dissatisfy; il- + legal = illegal; im- + moral = immoral; ir- + rational = irrational |
| Hyphen use | Before proper nouns; after ex- (former); with self-; to avoid ambiguity | ex-president, self-confident, anti-American, re-cover (cover again) vs. recover (get better) |
| Assimilation | The prefix changes form to match the first sound of the root | in- + legal = illegal; in- + possible = impossible; in- + rational = irrational; in- + balance = imbalance |
| Rule | Condition | Examples |
|---|---|---|
| Drop silent -e | Root ends in silent -e; suffix begins with a vowel | write + -ing = writing; advise + -or = advisor; argue + -ment = argument |
| Keep silent -e | Root ends in -ce or -ge; suffix begins with -able or -ous | notice + -able = noticeable; manage + -able = manageable; courage + -ous = courageous |
| Change -y to -i | Root ends in consonant + y; suffix does not begin with i | happy + -ness = happiness; beauty + -ful = beautiful; busy + -ness = business; rely + -able = reliable |
| Keep -y | Root ends in vowel + y; OR suffix begins with i | play + -ful = playful; joy + -ous = joyous; carry + -ing = carrying |
| Double final consonant | Root ends in CVC; suffix begins with vowel; stress on final syllable | run + -ing = running; begin + -er = beginner; control + -able = controllable; prefer + -ed = preferred |
| Do not double | Stress is NOT on the final syllable; or root ends in two consonants or two vowels | open + -ing = opening; listen + -er = listener; appear + -ance = appearance |
| -ic + adverb suffix | Root ends in -ic; adding adverb suffix -ly | basic + -ally = basically; systematic + -ally = systematically. Exception: public + -ly = publicly |
| -able vs. -ible | -able: suffix attaches to complete words; -ible: attaches to Latin roots where removal leaves an incomplete form | read → readable; agree → agreeable; permit → permissible; divide → divisible |
Error 1: Argument is correct — not arguement. The -e is dropped before -ment here.
Error 2: Manageable keeps the -e (not managable). The -e is retained before -able to preserve the soft g sound.
Error 3: Occurrence doubles the r (not occurence). Stress is on the final syllable: oc-CUR + -ence → occurrence.
Error 4: Definitely is spelled with -ite- (not definately). From definite + -ly; the -e is kept because the suffix begins with a consonant.
A word family is a group of words that share the same root and are related in both form and meaning. Recognising word families allows you to expand vocabulary exponentially rather than learning one word at a time.
| Root | Noun | Verb | Adjective | Adverb |
|---|---|---|---|---|
| act- | action, actor, activity, reaction, transaction | act, react, interact, transact, activate | active, reactive, interactive, actual, proactive | actively, actually, interactively |
| depend- | dependence, independence, dependent, dependency | depend | dependent, independent, dependable | dependably, independently |
| form- | form, formation, reform, information, performance | form, reform, inform, perform, transform, conform | formal, reformed, informative, transformative, uniform | formally, informatively |
| port- | port, import, export, transport, report, supporter | import, export, transport, report, support, deport | portable, imported, supportive, transportable | portably |
| graph- | graph, biography, photograph, geography, paragraph | photograph, autograph | graphic, photographic, geographical, biographical | graphically, geographically |
| spec-/spect- | spectator, inspection, prospect, respect, spectrum | inspect, expect, respect, suspect, prospect | spectacular, respective, prospective, suspicious | respectively, spectacularly |
When learning a new word, always ask: What is the root? What other words belong to this family? What prefixes and suffixes appear in each member? This habit transforms every new word into a cluster of ten or more related words.
Incorrect: It was disresponsible to ignore the warning.
Correct: It was irresponsible to ignore the warning.
responsible takes ir- (a form of in-), not dis-. When uncertain, use a dictionary.
Incorrect: She always mispells technical terms.
Correct: She always misspells technical terms.
mis- + spell = misspell. Both consonants are retained. Similarly: un- + necessary = unnecessary, dis- + satisfied = dissatisfied.
Incorrect: The decisions showed great decision. (noun used where abstract noun needed)
Correct: The decisions showed great decisiveness.
Always identify the required word class before selecting a suffix.
Incorrect: managable, hopfully, arguement, changable, publically
Correct: manageable (keep -e after soft g), hopefully, argument (drop -e), changeable, publicly (exception to -ically rule).
Incorrect: She was very successfulness in her career.
Correct: She was very successful in her career.
Not every suffix can be attached to every root. Practise with word family tables and check unfamiliar formations in a dictionary.
Incorrect: The findings were credable and reversable.
Correct: The findings were credible and reversible.
As a rough guide: if removing the suffix leaves a complete word, -able is more likely (readable, agreeable). If not, -ible is more likely (credible, visible). When in doubt, check.
Exercise A — Identifying Prefix and Root
In each word below, identify the prefix and the root. Then state the meaning added by the prefix.
Exercise B — Identifying Suffix and Word Class Change
For each word, identify the suffix and base word. State the word class of the base word and the word class of the new word.
Exercise C — Choosing the Correct Negative Prefix
Add the correct negative prefix (un-, in-, il-, im-, ir-, dis-, mis-, non-) to each word. Justify your choice.
Exercise D — Word Class Transformation
Use the root word given to complete each gap with the correct form. The required word class is shown in brackets.
Exercise E — Spelling Correction
Each word below has been incorrectly formed. Identify the error and write the correct spelling.
Exercise F — Building Word Families
For each root given, create as many members of the word family as you can.
| Root | Noun(s) | Verb(s) | Adjective(s) | Adverb(s) |
|---|---|---|---|---|
| nation- | nation, … | nationalise, … | national, … | … |
| employ- | … | employ, … | … | … |
| inform- | … | inform, … | … | … |
| success- | … | … | … | … |
| critic- | … | … | … | … |
Exercise G — Error Correction in Context
Each sentence contains one error related to prefix or suffix use. Identify the error and rewrite the sentence correctly.
