Definitions for (verb) nullify

Main entry: negate, neutralise, neutralize, nullify

Definition: make ineffective by counterbalancing the effect of

Usage: Her optimism neutralizes his gloom; This action will negate the effect of my efforts

Main entry: nullify, invalidate

Definition: show to be invalid

Main entry: void, avoid, annul, invalidate, nullify, quash

Definition: declare invalid

Usage: The contract was annulled; void a plea