Main Entry:

an·nul

Pronunciation:

\ə-ˈnəl\

Function:

transitive verb

Inflected Form(s):

an·nulled; an·nul·ling

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>

synonyms see nullify