(esp. of laws or other established rules, usages, etc.) to make void or null; abolish; cancel; invalidate

to annul a marriage.

to reduce to nothing; obliterate.

to cancel (a regularly scheduled train, plane, social event, etc.) for one day or one time only.

verb

keep , restore , retain , revalidate , validate

verb

abate , abolish , abrogate , annihilate , blot out , call off , cancel , countermand , declare , delete , discharge , dissolve , efface , erase , expunge , get off the hook , invalidate , kill , negate , neutralize , nix , nullify , obliterate , quash , recall , render null and void , repeal , rescind , retract , reverse , revoke , scrub * , undo , vacate , vitiate , wipe out * , set aside , void , blot , cross , rub , scratch , strike , wipe , x , blank , disaffirm , disannul , disclaim , divorce , end , overrule , recant , supersede , withdraw