GNU Collaborative International Dictionary of English

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1.       
   Nullify , v. t. [imp. & p. p. Nullified ; p. pr. & vb. n. Nullifying .] [L. nullificare; nullus none + -ficare (in comp.) to make. See Null, a., and -fy.] To make void; to render invalid; to deprive of legal force or efficacy.
   1913 Webster
   Such correspondence would at once nullify the conditions of the probationary system.
   I. Taylor.
   
   1913 Webster
   Syn. -- To abrogate; revoke; annul; repeal; invalidate; cancel. See Abolish.
   1913 Webster