Merriam-Webster Online Dictionary

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One entry found for annul.
Main Entry: anĚnul
Pronunciation: &-'n&l
Function: transitive verb
Inflected Form(s): anĚnulled; anĚnulĚling
Etymology: Middle English annullen, from Anglo-French annuller, from Late Latin annullare, from Latin ad- + nullus not any -- more at NULL
Date: 15th century
1 : to reduce to nothing : OBLITERATE
2 : to make ineffective or inoperative : NEUTRALIZE <annul the drug's effect>
3 : to declare or make legally invalid or void <wants the marriage annulled>
synonym see NULLIFY