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Definition of nullify : To make void; to render invalid; to deprive of legal force or efficacy.

Synonyms:

fend off, countermand, obviate, subjugate, remove, do in, continue, keep down, contravene, abate, abrogate, avoid, keep off, rescind, forfend, exterminate, knock off, lift, void, belie, deflect, overthrow, stave off, repress, end, waste, ward off, head off, neutralise, supplant, action, extirpate, prohibit, subvert, evacuate, repeal, quash, countervail, vitiate, set aside, reduce, liquidate, avert, stamp out, terminate, forefend, suppress, debar, subdue

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

disprove, check, overturn, dispute, invert, renounce, contradict, counterwork, reverse

disappear, empty, vacate, disintegrate, annihilate

correct, offset, adjust, tune, counterbalance, compensate, balance, square, counteract, set

Usage examples:

• Thus it will be seen that these witnesses nullify each other. - "Abraham Lincoln: Was He A Christian?", John B. Remsburg.
• A striking instance of this is furnished by the power to nullify legislative gerrymanders. - "The American Judiciary", Simeon E. Baldwin, LLD.
• The maintenance of the Union brings with it " the support of the State governments in all their rights," but it is not one of the rights of any State government to renounce its own place in the Union or to nullify the laws of the Union. - "Complete State of the Union Addresses from 1790 to the Present", Various.