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Definition of nullify:

  1. To make void; to render invalid; to deprive of legal force or efficacy.


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

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