Definition from Wiktionary, the free dictionary
Alternative forms 
- cancelation (US)
- Rhymes: -eɪʃən
cancellation (plural cancellations)
- The act, process, or result of canceling; as, the cancellation of certain words in a contract, or of the contract itself.
- (mathematics) The operation of striking out common factors, in both the dividend and divisor.
- (philately) A postmark that marks a postage stamp so as to prevent its reuse.
- (law) In United States intellectual property law, a proceeding in which an interested party seeks to cancel the registration of a trademark or patent.
act of cancelling