nullify has definitions from the field of law
1
[ verb ] show to be invalid

Synonyms

invalidate

Related terms

validate negate

2
[ verb ] (law) declare invalid

Examples

"The contract was annulled" "avoid a plea"

3
[ verb ] make ineffective by counterbalancing the effect of

Examples

"Her optimism neutralizes his gloom" "This action will negate the effect of my efforts"

Related terms

weaken nullification

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