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annul (v.)

late 14c., "invalidate, make void, nullify;" from Anglo-French and Old French anuler "cancel, wipe out" (13c.) or directly from Late Latin annullare "to make to nothing," from Latin ad "to" (see ad-) + nullum, neuter of nullus "nothing, none," from PIE root *ne- "not." Related: Annulled; annulling.

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Definitions of annul

annul (v.)
declare invalid;
The contract was annulled
Synonyms: invalidate / quash / void / avoid / nullify
annul (v.)
cancel officially;
From wordnet.princeton.edu