What is the meaning of cancel?

noun

• A notation cancelling a previous sharp or flat.
  • synonyms: natural

verb

• Postpone indefinitely or annul something that was scheduled.
  • usage: "Call off the engagement"; "cancel the dinner party"; "we had to scrub our vacation plans"; "scratch that meeting-the chair is ill"
  • synonyms: call off, scratch, scrub
• Make up for.
  • usage: "His skills offset his opponent's superior strength"
  • synonyms: offset, set off
• Declare null and void; make ineffective.
  • usage: "Cancel the election results"; "strike down a law"
  • synonyms: strike down
• Remove or make invisible.
  • usage: "Please delete my name from your list"
  • synonyms: delete
• Make invalid for use.
  • usage: "cancel cheques or tickets"
  • synonyms: invalidate