Definition of annul

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an·nul    (-nl) KEY 

TRANSITIVE VERB:
an·nulled, an·nul·ling, an·nuls

1. To make or declare void or invalid, as a marriage or a law; nullify.
2. To obliterate the effect or existence of: "The significance of the past . . . is annulled in idle gusts of electronic massacre" (Alexander Cockburn).

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ETYMOLOGY:
Middle English annullen, from Old French annuller, from Late Latin annullre : Latin ad-, ad- + Latin nullus, none; see ne in Indo-European roots