cancellation

n. revocation, nullification

Cancel may refer to: Cancellation (mail), in mail, a postal marking applied to a stamp or stationery indicating that the item has been usedCancellation (television), the termination of a television seriesCancel message, in Usenet, a special message used to remove articles posted to news serverCancel character, in telecommunication, an indication that the data with which it is associated are in error or are to be disregardedCancellation property, the property that if a * b = a * c then b = cNoise cancellation, a method for reducing unwanted soundPhase cancellation, the effect of two waves that are out of phase with each other being summedCancellation of removal, a form of immigration relief available to aliens in the United States who be otherwise inadmissible or deportable.Loss of significance when doing calculations with floating point numbers."Cancelled" (South Park) an episode of South Park.
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Noun
1. the act of cancelling; calling off some arrangement
(hypernym) nullification, override
(hyponym) abrogation, repeal, annulment
(derivation) cancel, call off
2. the speech act of revoking or annulling or making void
(hypernym) negation
(derivation) cancel, strike down

(n.)
The operation of striking out common factors, in both the dividend and divisor.
  

(n.)
The act, process, or result of canceling; as, the cansellation of certain words in a contract, or of the contract itself.
  

Refers to Section 6 (b) of the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA) which authorizes cancellation of a pesticide registration if unreasonable adverse effects to the environment and public health develop when a product is used according to widespread and commonly recognized practice, or if its labeling or other material required to be submitted does not comply with FIFRA provisions.