accumulative, a. cumulative.

accuracy, n. exactness, fidelity, correctness, precision.  Antonyms:  inaccuracy, incorrectness, error.

accurate, a. correct, exact, just, true, literal.  Antonyms:  inaccurate, incorrect, erroneous.

accusation, n. crimination, charge, indictment, impeachment, arraignment, allegation, incrimination.

accusative, a. incriminatory, inculpatory, accusatory.

accuse, v. indict, charge, impeach, incriminate, arraign, criminate.

accuser, n. complainant, plaintiff, informant, prosecutor.

accustom, v. habituate, familiarize, inure.

accustomed, a. customary, wonted, habitual, usual.  Antonyms:  unaccustomed, unfamiliar, unwonted.

achieve, v. accomplish, effectuate, realize, effect, attain.

achievement, n. accomplishment, attainment, effectuation feat, exploit.

acknowledge, v. admit, avow, concede, own, confess.  Antonyms:  repudiate, deny, disavow.

acknowledgment, n. admittance, avowal, concession, recognition.

acme, n. culmination, top, zenith, climax, apex, pinnacle.

acorns, n. pl. mast.  Associated Words:  balaniferous, balanoid, cupule, cupuliferous, quercite, racahout.

acquaint, v. familiarize, inform, tell, apprise, notify.

acquaintance, n. familiarity; kith.  Antonyms:  ignorance, unfamiliarity, unacquaintance.

acquirement, n. acquisition, attainment.

acquit, v. discharge, release, exculpate, exonerate.

acquittal, n. release, discharge, exoneration, exculpation.

acrid, a. pungent, biting, corrosive, caustic.

acridity, n. pungency, bitterness, causticity, acrimony.

acrimonious, a. caustic, sarcastic, censorious, virulent, rancorous.

acrimony, n. asperity, bitterness, virulence, causticity, rancor, sharpness.

acrobat, n. equilibrist, tumbler, funambulist, vaulter.

across, prep. and adv. athwart, crosswise, traverse transversely.

act, n. performance, feat, stunt (Colloq.), exploit, achievement, deed, action, procedure, turn; decree, edict, law, statute, enactment, ordinance.

act, v. behave, deport one’s self; play, personate, impersonate, mimic; feign, counterfeit, simulate, dissemble.

acting, n. personation, impersonation, simulation, feigning, stage-playing, histrionicism, histrionism, affectation mimicry, pantomime (acting without speaking).

action, n. agency, operation, movement, activity; pl. conduct, behavior, deportment, deeds; (Law) lawsuit, litigation, suit.  Antonyms:  inaction, stagnation, inactivity, inertia.

active, a. brisk, nimble, agile, sprightly, spirited; strenuous, diligent, enterprising; operative, efficacious, drastic; effective; transitive.  Antonyms:  inactive, passive, latent, quiescent, sedentary.

activity, n. operation, action; liveliness, briskness, agility, sprightliness, strenuousness.  Antonyms:  inactivity, passiveness, quiescence.