v 1: declare invalid; "The contract was annulled"; "avoid a plea"
[syn: annul, quash, void, avoid, nullify]
[ant: validate]
2: of cheques or tickets [syn: cancel]
3: show to be invalid [syn: nullify] [ant: validate]
4: take away the legal force of or render ineffective;
"invalidateas a contract" [syn: void, vitiate] [ant: validate]