• of legal force, operative, to operate
• null, of no effect, unavailable
• to become operative, to come into effect, to come into force, to take effect
• to abate, to frustrate, to invalidate, to null, to nullify, to quash, to repeal, to rescind, to revoke, to stultify, to supersede, to vacate
• cancellation, invalidation, recission, repeal