A-, on: away, alive; at: ahead: of: akin.

And-, against (Greek anti-): answer (sweri-an, to declare).

Be-, old form of by: betimes, bypath; in verbs: bedaub (daub all over), bewail (wail for), benumb (make numb).

For-, intensifies the meaning, (thoroughly): forbear, forlorn, forswear, forbid (command against), forego.

Fore-, first, before: foresight, forejudge.

Mis-, wrong, wrongly: misdeed, miscall, mislead.

Un-, not: unholy, unafraid. In verbs, it indicates the reverse of the simple verb: unbind, unfold, unmask.

With-, against, (from): withstand, withers (of a horse), withhold.

After, after: aftergrowth, aftermath (= after the mowing), afterthought.

All (old Eng. al), all: almost, alone.

Forth, forth: forthcoming.

In (French en), in: inborn, illusion, import, irruption; encase, enclose; entwine, embody, employ; enable = to make able, embitter.

Off or of, off, from: offal = what falls off, offspring.

On, against, towards: onset, onslaught, onward.

Out has a sense of direction or surpassing, (beyond): outcast, outpost, outrun, outshine; utter, utmost (i.e., outer, outmost).

Over, over, above: overhead, overcoat, overturn, overspread, over-bold.

Through = thorough: throughout, thoroughfare, thoroughbred, through-ticket.

Twi, two, double: twice, twilight = double or doubtful light, twill, twin = double, twine, twist = two strands twisted.

Under, below, lower: underhand, underlie, underneath, undertone.

Up, up: upland, upshot, upbraid, uphold, uprise, upward.

A-, ab-, (ab-s-), away from: avert, absent, ab-s-tract; Fr., avaunt.

Ad-, (Fr. a-) (-d is often changed because of the influence of the following consonant), to: adapt, abbreviate, accord, affect, aggression, allude, annul, arrogate, attain; Fr., achieve, acquaint, amount.

Amb- or am-, around, round about, (both): ambition (lit. going about, canvassing), ambiguous, ambidextrous, amputate (to cut around).

Ante-, before: antedate, ante-room, anticipate; Fr., an- in ancestor = antecessor.

Bis- and bi-, twice, two: bias (= two-faced), biped, bisect, biscuit (= twice baked).

Circum-, around: circumference, circuit, circulate, circumvent.

Cum-, with, takes the forms com-, con-, col-, co-, cor-, under the influence of the letter following: compound, concord, collect, coÖperate, correct, counsel.

Contra-, against: contradict; Fr., controvert, counterfeit.

De-, down, from: decline, deduct, decamp. It is negative in derange, deform, destroy; intensive in declare, deprave, despoil, desolate, desiccate.

Dis-, di-, asunder, separation: disarm, diffuse, disown, divorce; Fr., des-, de- in defer, defy, delay, descant.

Ex-, e-, out, out of, proceeding from: exclude, exhale, ex-governor, extract, educe, elect, emanate, evade.

Extra-, beyond: extraneous, extraordinary, extravagant.

In-, in, into, on: infer, invade, invent. It also becomes il-, im-, ir-, before certain consonants, as illusion, improve, irrigate.

In-, not: incapable, illiberal, impious, irrelevant, ignoble.

Inter-, intro-, among, between, within: interfere, intervene, introspection.

Male-, bad, ill, wrong: malcontent, malpractice, maltreat.

Mis-, ill, wrong: misadventure, misalliance; Fr., mischief.

Non-, not: nonage, nonentity, nonsense.

Ob-, toward, facing, against: object, obstruct. It also becomes oc-, of-, op-: occur, offer, oppose.

Pene-, almost: peninsula, penult.

Per-, through, often intensive, throughout, thoroughly—and so wrongly: perspire, pervade; persist, perturb, pervert; pellucid, pilgrim (see ager). Fr. par-: pardon.

Post-, after: postdate, posthumous, post-mortem, postscript.

Pre-, before: precede, precursor, preËmpt, premature, premise, prevent.

Preter-, beyond, more than: preterite (of past time), preternatural.

Pro-, before, for, forward: proceed, proconsul, prologue, pronoun, provide; por-tend. Fr., pur: purchase, pursue.

Re-, red-, back, again: rebel, recede, recover, redeem.

Retro-, backwards: retroactive, retrograde, retrospect.

Se-, sed-, apart: seclude, secrete, sed-i-tion (a going apart), segregate.

Sub-, under, from under: subject, subtract. It also becomes suc-, suf-, sug-, sum-, sup-, sur-, sus-, as in succor, suffer, suggest, supplant, suspend; subdivision (i.e., lower), summon (sub = slightly), surreptitious.

Super-, above, beyond: superfine, supernatural, superposed; Fr., sur-, surname, surpass, surtout (= over all).

Trans-, across: transcend, transient; tradition, traverse; Fr., tres-, trespass.

Ultra-, beyond: ultramarine, ultra-radical, ultra-tropical.

Vice-, in place of: vice-consul, vice-president, viceroy; vicar.

A-, an- (before vowels), not: a-nom-alous = ir-regular, an-archy, an-onym-ous, apathy, atheist; a-morph-ous = formless, an-aemia = bloodlessness, an-odyne = something that relieves pain.

Amphi-, on both sides, double: amphibious, amphitheatre.

Ana-, up, back, anew: anatomy, analysis, anagram, analogy, anathema.

Anti-, against: antarctic, antidote, antipathy, antipodes, Antichrist, anticlimax.

Apo-, from, away from, off: apology, apostle, apostrophe, aphelion, apogee (ge = earth), apostasy.

Arch-, chief: archangel, archbishop, archfiend, archi-tect.

Auto-, self: autocrat, autograph, automobile, autonomy, automatic, aut-opsy.

Cata-, down, (thoroughly): cataract, catastrophe, catechise, catalogue, (a complete numbering).

Dia-, through, (between): diagonal, diagram, dialogue, diapason, diaphragm.

Dis-, di-, twice, doubly: dissyllable, di-phthong, dilemma.

Dys-, ill, bad: dysentery, dyspepsia.

Ec-, ex-, out, out of: ec-centric, ec-lipse, ec-stasy, exegesis, exodus, exorcise.

En-, in: energy, emblem, emphasis, empiric, encomium, encyclic, endo-gen.

Epi-, upon, to: epidemic, epigram, epistle, epitaph, ep-hemeral, ep-och.

Eu-, well: eucharist, eulogy, euphemism, euphony, ev-angel = good news.

Exo-, outside, without: exo-gen, exoteric, exotic.

Hemi-, half: hemicycle, hemisphere, hemi-stich.

Hyper-, over, beyond measure: hyperbole, hypercritical, hypertrophy.

Hypo-, under: hypocrite, hypodermic, hypothesis, hyp-hen (= one).

Meta-, after, between, (changed for): metaphor, metathesis, metamorphosis, metonymy, met-hod = after a way (hodos).

Para-, beside, near by, contrary to: parable, paradox, parallel, parish, parody, par-helion.

Peri-, around, near: period, perimeter, perigee (ge = earth), perihelion.

Pro-, before, for: problem, prologue, prophet = interpreter.

Syn-, with, together: synagogue, syntax, syl-lable, sym-pathy, sy-stem.