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Synonyms for Cancel (same or very similar meaning)

WordNet sense 1 (a notation cancelling a previous sharp or flat):
natural

WordNet sense 2 (make up for):
offset, set off

WordNet sense 3 (postpone indefinitely or annul something that was scheduled):
scratch, scrub, call off

WordNet sense 4 (declare null and void; make ineffective):
strike down

WordNet sense 5 (remove or make invisible):
delete

WordNet sense 6 (make invalid for use):
invalidate


From the ODE community, based on WordNetadd/edit