#1 negate v. [contradict, belie] be in contradiction with. wn
#2 negate v. [contradict, contravene] deny the truth of. wn
#3 negate v. [contradict] prove negative; show to be false. wn
#4 negate v. [neutralize, neutralise, nullify] make ineffective by counterbalancing the effect of; "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts". wn
vizzz