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Definition of annul : 1. To make void or of no effect; to nullify; to abolish; to do away with; - used appropriately of laws, decrees, edicts, decisions of courts, or other established rules, permanent usages, and the like, which are made void by component authority.
2. To reduce to nothing; to obliterate.

Synonyms:

keep off, remove, null, rear, overthrow, reverse, rub, revolutionize, disannul, bowl over, counterbalance, renounce, hoist, bring down, cabbage, prohibit, subvert, keep down, sneak, purloin, compensate, raise, bar, award, knock over, make up, swipe, head off, nobble, go up, wind, get up, set aside, resign, filch, plagiarize, counteract, abandon, avoid, terminate, neutralise, upset, deflect, snarf, pilfer, render void, vitiate, change by reversal, tip over, overrule, come up, uprise, correct, abrogate, repeal, rise, debar, overturn, elevate, vacate, turn, void, rustle, continue, extirpate, citation, turn back, reduce, call for, arise, forfend, plagiarise, subjugate, tump over, negative, charge, rescind, obviate, suppress, acquit, roll back, lift, bring up, ward off, revolutionise, face-lift, empty, strike down, counterpoise, turn over, forefend, move up, study atabolish, countermand, blot, quash, wipe, abstract, subdue, fend off, hook, give up, override, scratch, avert, supplant, exterminate, airlift, cross, pinch, invert, end, bring in a verdict, evacuate, stamp out, repress, stave off, abate, acquittal

deny, eliminate, efface, extinguish, dissolve, reject, disclaim, invalidate, eradicate, nullify, retract, disavow, veto, refute, abnegate, neutralize, destroy, withdraw, obliterate, disaffirm, delete, abolish, repudiate, revoke, negate, undo, dismiss, cancel, divorce

edit, annihilate, expurgate, erase, expunge, omit, censor, cut, strike

Usage examples:

• Hardly had this letter been mailed when she consulted her attorney as to ways and means to annul this " crazy marriage." - "Our Nervous Friends Illustrating the Mastery of Nervousness", Robert S. Carroll.
• The people were eager to annul their sentence against Marcius, and to beg him to return, but the Senate, after meeting and considering this proposal, finally rejected it, either out of a mere spirit of opposition to anything proposed by the people, or because they did not wish him to return by favour of the people; or it may be because they themselves were now angry with him for having shown himself the enemy of all classes alike, although he had only been injured by one, and for having become the avowed enemy of his country, in which he knew that the best and noblest all sympathised with him, and had suffered along with him. - "Plutarch's Lives, Volume I (of 4)", Plutarch.
• The proposition, that, in case of a supposed violation of the Constitution by Congress, the States have a constitutional right to interfere and annul the law of Congress, is the proposition of the gentleman. - "Select Speeches of Daniel Webster", Daniel Webster.