1. (noun)natural, cancel a notation cancelling a previous sharp or flat
2. (verb)cancel, call off, scratch, scrub postpone indefinitely or annul something that was scheduled "Call off the engagement"; "cancel the dinner party"; "we had to scrub our vacation plans"; "scratch that meeting--the chair is ill"
3. (verb)cancel, offset, set off make up for "His skills offset his opponent's superior strength"
4. (verb)cancel, strike down declare null and void; make ineffective "Cancel the election results"; "strike down a law"
5. (verb)delete, cancel remove or make invisible "Please delete my name from your list"
6. (verb)cancel, invalidate makeinvalid for use "cancel cheques or tickets"