What is Cancel ?
Cancel is (verb) 1. to stop something which has been planned The singer was ill, so the show had to be cancelled. There is no refund if you cancel less than three weeks before the date of departure. The trip was cancelled because the weather was too bad. 2. to mark a postage stamp with a rubber stamp to show that it has been used (NOTE: cancelling – cancelled but the US spelling is canceling – canceled)
source: Easier English, Student Dictionary Upper Intermediate Level