Annul - Definition

v 1: declare invalid; "The contract was annulled"; "void a plea"
[syn: invalidate, annul, quash, void, avoid,
nullify] [ant: formalise, formalize, validate]
2: cancel officially; "He revoked the ban on smoking"; "lift an
embargo"; "vacate a death sentence" [syn: revoke, annul,
lift, countermand, reverse, repeal, overturn,
rescind, vacate]