Nullify (Verb)
Meaning 1
Declare invalid; "The contract was annulled"; "void a plea".
Classification
Verbs of political and social activities and events.
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Meaning 2
Make ineffective by counterbalancing the effect of; "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts".
Classification
Verbs of size, temperature change, intensifying, etc..
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Meaning 3
Show to be invalid.
Classification
Verbs of thinking, judging, analyzing, doubting.