| Prefix | Definition | Examples |
| A | Not, without | Atypical, asymmetrical, anonymous, anecdote, atheist |
| Ab | Away, from, off | Abduct, abscond, abominate, abrupt |
| Acro | Above, top, up, topmost, high | Acropolis, acrobat, acronym |
| Ad | To, toward, against | Adhere, adjudicate, abet, affluent, adversity |
| An | Not, without | Anonymous, anecdote, anarchy, anomaly, anesthesia, analgesic |
| Ante | Before | Anteroom, anterior, antedate, antecedent, ante, antebellum |
| Anti | Before | Anticipate, antique, antiquity |
| Anti | Against, opposite | Antifreeze, antitrust, antisocial, antibiotic, antagonist, |
| Auto | Self, | Automobile, autopsy, automat, autograph, automatic, autocrat, autonomy |
| Be | About, near, make, completely, by | Before, belittle, bespectacled, befuddled, because, bejeweled |
| Bi | Two | Biscuit, bisect, bicentennial, binoculars, bigamy, bigamist |
| Bio | Life | Biochemistry, biography, biodegradable, biopsy, biosphere |
| Circum | around | Circumference, circumnavigate |
| Co | Together, with | Co-education, cooperate, coexist, coherent |
| Col | Together, with | Collaborate, collusion, colloquial |
| Com | Together, with | Compress, complicate, computer |
| Con | Together, with | Converse, condone, consensus, congenital, consummate |
| Contra | Against | Contraband, contradict |
| Cor | Together, with | Correlate, corrupt |
| Counter | Against | Countermand, counterfeit |
| De | Aside, away, down, off, from, apart, completely | Demote, decapitate |
| Dec | Ten | Decathlon, decimate, December |
| Di | Not, away, apart | Divorce, diversion, diverse, divert |
| Dia | Through, between | Diameter, dialogue |
| Dif | Not, away, apart | Diffident, diffuse |
| Dis | Not, away, apart | Disaster, disease, distract, display Dissect, dismantle, disseminate |
| Dys | Bad, ill, | Dysfunction, dyslexia, dysentery |
| E | Out | Eject, emit, emigrate |
| Em | In, into, on, within | Empower, embrace |
| En | In, into, on | Enclosure, entrust |
| Endo | Within | Endocrine, endoderm |
| Epi | On, upon | Epidermis, epitaph, epitome |
| Equ | Equal | Equivalent, equinox, equilateral |
| Es | Out | Escape |
| Eu | Good, well | Eulogy, eulogize, euthanasia, eucalyptus |
| Ex | Out | Expel, excavate, extort |
| Extra | Outside, beyond | Extraterrestrial, extramural, extraneous, extravaganza |
| For | Away, against | Forget, forbid, forfeit, forgive |
| Fore | Before, in front of | Forehead, forecast, forerunner, |
| Geo | Earth | Geocentric, geodesic, geography |
| Hemi | Half | Hemisphere, hemitrope, hemicycle |
| Hetero | Different | Heterogeneous, heterosexual, heterodox |
| Hex | Six | Hexagon, hexameter, hexagram |
| Homo | Same | Homogenize, homogeneous, homosexual, homologous |
| Homo | Human | Homicide, homage, Homo sapiens |
| Hyper | Over | Hyperactive, hyperbole |
| Hypo | Under | Hypothesis, hypocrisy, hypodermic |
| Il | In, into | Illumine |
| Il | Not | Illicit |
| Im | In, into | Impede |
| Im | Not | Immobile, impervious, impunity |
| In | In, into | Insect, induce, innate, incur infer |
| In | Not | Intangible, inclement, inadvertent |
| Infra | Beneath, below | Infrastructure, infrared |
| Inter | Between, beside | Interstate, intermediary, interim |
| Intra | Within | Intramural, intravenous |
| Intro | Within | Introduce, introspective, introvert |
| Ir | In, into | Irrigate |
| Ir | Not | Irreverent, irredeemable |
| Mal | Bad | Malnutrition, |
| Micro | Small | Microbe, micrometer, microfiche, microphone |
| Mini | Small | Miniscule, miniskirt |
| Non | Not | Nonentity, nontoxic, nonsense |
| Ob | Against, toward | Obstruct, obstacle, observe |
| Omni | All | Omnivorous, omnipotent, omnibus |
| Op | Against, toward | Oppose, opponent, opposite |
| Ortho | Straight | Orthodontist, orthopedics |
| Para | Beside | Paranoid, parable, paraphrase |
| Per | Through | Pervade, perceive, permit |
| Peri | Around, near | Periphery, peripheral, periscope |
| Post | After | Postdate, postscript, postpone |
| Pre | Before | Prevent, prevail, prejudge, precise |
| Pro | Forward, before, for, forth | Proclaim, produce, propel, proceed, provide |
| Pseud | False | Pseudonym |
| Re | Back, again | Recede, receive |
| Retro | Backward | Retroactive |
| Se | Aside, apart | Separate, seclude, secede, secrete |
| Sub | Under | Submit |
| Super | Above, over | Superfluous |
| Un | Not | Unfavorable, unlike, unexpected, unfathomable |