WordWeb Online

1. Postpone indefinitely or annul something that was scheduled
   "cancel the dinner party";
   - call off, scratch, scrub
    
2. Make up for
   "His skills cancel his opponent's superior strength";
   - offset, set off
    
3. Declare null and void; make ineffective
   "Cancel the election results";
   - strike down
    
4. Remove or make invisible
   "Please cancel my name from your list";
   - delete
    
5. Make invalid for use
   "cancel cheques or tickets";
   - invalidate
    
6. (mathematics) simplify by removing a common factor from both the numerator and denominator of a fraction, or from both sides of an equation

1. A notation cancelling a previous sharp or flat
   - natural

Derived forms: cancels, canceling, cancelling, cancelled

Type of: adjudge, balance, declare, equilibrate, equilibrise [Brit], equilibrize, hold, mark, musical notation, remove, score, take, take away, withdraw

Encyclopedia: Cancel, David