annul
an·nul / əˈnəl/ • v. (-nulled, -nul·ling) [tr.] (usu. be annulled) declare invalid (an official agreement, decision, or result): the elections were annulled by the general amid renewed protests. ∎ declare (a marriage) to have had no legal existence.DERIVATIVES: an·nul·ment n.
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annul