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nullify

nul·li·fy

nullify

 
 
pronunciation:
nuh lih faI
part of speech: transitive verb
inflections: nullified, nullifies, nullifying
definition 1: to cause or declare to have no legal force or effect; make null; invalidate.
synonyms:
abrogate, annul, invalidate, negate, quash, rescind, void
antonyms:
ratify
similar words:
abate, abolish, annihilate, cancel, countermand, override, overturn, remit, repeal, retract, reverse, revoke, veto, vitiate
definition 2: to cause to have no value or consequence.
Our extra effort nullified our opponents' early lead.
synonyms:
cancel, compensate for, counteract, neutralize, offset
similar words:
abolish, annihilate, annul, balance out, counterbalance, destroy, eliminate, negate, overcome, revoke, vitiate
derivation: nullifier (n.)