annul


Concise Oxford English Dictionary © 2008 Oxford University Press:
annul /əˈnʌl/
verb (annuls, annulling, annulled) declare (a law or contract, especially that of marriage) invalid.
– derivatives
annulment noun.
– origin ME: from OFr. anuller, from late L. annullare, from ad- ‘to’ + nullum ‘nothing’.
'annul' also found in these Oxford entries:

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