#1
nullify v. [
invalidate, annul, quash, void, avoid] declare invalid; "The contract was annulled"; "void a plea"
. wn #2
nullify v. [
invalidate] show to be invalid
. wn #3
nullify v. [
neutralize, neutralise, negate] make ineffective by counterbalancing the effect of; "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"
. wn