nullify

v 1: declare invalid; "The contract was annulled"; "avoid a plea"

[syn: {invalidate}, {annul}, {quash}, {void}, {avoid}]

[ant: {validate}]

2: show to be invalid [syn: {invalidate}] [ant: {validate}]

3: make ineffective by counterbalancing the effect of; "Her

optimism neutralizes his gloom" [syn: {neutralize}]