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nullify

nul·li·fy [ núllə f ] (past and past participle nul·li·fied, present participle nul·li·fy·ing, 3rd person present singular nul·li·fies)


transitive verb 
Definition:
 
1. make something invalid: to make something legally invalid or ineffective

2. cancel something out: to have the effect of canceling something out


nul·li·fi·er noun

Word Key: Synonyms
nullify, abrogate, annul, repeal, invalidate, negate
CORE MEANING: to put an end to the effective existence of something

nullify to make something legally invalid or ineffective;
Only the courts can nullify his decision.
The country's military rulers nullified national elections after pro-democracy candidates won a landslide victory.
abrogate (formal) to declare a legal document or agreement invalid;
Egypt and Somalia abrogated their friendship treaties with the USSR in the 1970s.
We condemn the levity with which certain politicians speak about abrogating our international obligations.
annul to declare a legal document or agreement invalid;
A court on Wednesday annulled the decree, saying it was illegal.
Many parties have called for the election results to be annulled because of alleged fraud.
repeal to officially end the validity of something such as a law;
We intend to repeal the act when alternative regulations are in place.
invalidate to deprive something of its legal force or value, e.g., by failing to comply with some terms and conditions;
Failure to disclose all relevant changes may invalidate your policy.
Does the result of this latest poll invalidate the findings of the earlier survey?
negate (formal) to declare officially that something is invalid or ineffective, or make something invalid or ineffective;
This argument does not negate the point I am making.
She used her speed and experience to negate her opponent's power, winning the match in straight sets.
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