ابطال (اسم)
waiver, cancellation, annulment, revoke, nullification, rescission, disproof, defeasance, vitiation, voidance
شکست (اسم)
fracture, deflection, break, washout, failure, reverse, defeat, setback, losing, breakage, defeasance, defeature, refraction, flunk, fizzle, plumper, unsuccess
باطل سازی (اسم)
revocation, defeasance, invalidation
بطلان (اسم)
nullity, defeasance, invalidity
شرط بطلان یا القاء (اسم)
defeasance