Definition from Wiktionary, the free dictionary
Alternative forms 
- IPA: /kænsəl̩/
cancel (third-person singular simple present cancels, present participle cancelling (Commonwealth), canceling (American), simple past and past participle cancelled (Commonwealth), canceled (American))
- (transitive) To cross out something with lines etc.
- (transitive) To invalidate or annul something.
- He cancelled his order on their website.
- (transitive) To mark something (such as a used postage stamp) so that it can't be reused.
- This machine cancels the letters that have a valid zip code.
- (transitive) To offset or equalize something.
- The corrective feedback mechanism cancels out the noise.
- (transitive) (mathematics) To remove a common factor from both the numerator and denominator of a fraction, or from both sides of an equation.
- (transitive) (media) To stop production of a programme.
mark as used
remove a common factor
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cancel (plural cancels)
- A cancellation (US); (nonstandard in some kinds of English).
- (obsolete) An inclosure; a boundary; a limit.
- A prison is but a retirement, and opportunity of serious thoughts, to a person whose spirit […] desires no enlargement beyond the cancels of the body. — Jeremy Taylor.
- (printing) The suppression on striking out of matter in type, or of a printed page or pages.
mark cancelling a sharp or flat