invalidation (n.)

• abolishment
• abolition
• abrogation
• annulment
• cancel
• cancellation
• countermand
• disproof
• explosion
• expose
• exposure
• frustration
• negation
• neutralization
• nullification
• recall
• recantation
• renege
• repeal
• rescission
• retraction
• reversal
• revocation
• revoke
• suspension
• thwarting
• undoing
• vacation
• vitiation
• voidance
• voiding
• waiver
• withdrawal
• write-off