cancellation

1. The act, process, or result of cancelling; as, the cancellation of certain words in a contract, or of the contract itself. (countable, uncountable)
2. The operation of striking out common factors, e.g. in both the dividend and divisor. (countable, uncountable)
3. A postmark that marks a postage stamp so as to prevent its reuse. (countable, uncountable)
4. In United States intellectual property law, a proceeding in which an interested party seeks to cancel the registration of a trademark or patent. (countable, uncountable)
5. The property of being cancellate. (countable, uncountable)

Plural cancellations