1 void, annul, invalidate, nullify, quash; revoke, rescind, redeem, repeal, abolish, retract, withdraw, recall, repudiate, abrogate, countermand, deny:
The bonds have been cancelled and are worthless. She cancelled the incorrect cheque.
2 delete, obliterate, cross or strike or blot out, dele, rub out, erase, expunge, efface, eradicate, quash, deracinate; eliminate, do away with:
I was forced to cancel the chapter of my book that dealt with M.I.5 activities.
3 Sometimes, cancel out. neutralize, nullify, counterbalance, countervail, compensate (for), make up for, offset, counteract:
His later kindnesses cancel his previous injustices.