See annul in Webster's New World Roget's A-Z Thesaurus II
verb
To put an end to, especially formally and with authority:
abolish, abrogate, annihilate, cancel, invalidate, negate, nullify, set aside, vitiate, void. (Law) extinguish. See continueTo remove or invalidate by or as if by running a line through or wiping clean:
blot (out), cancel, cross (off or out), delete, efface, erase, expunge, obliterate, rub (out), scratch (out), strike (out), undo, wipe (out), x (out). (Law) vacate. See continue
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