Definition of perforce adverb from the Oxford Advanced American Dictionary

     

    perforce

     adverb
    adverb
    NAmE//pərˈfɔrs//
     
    (old use or formal)
     
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  1. 1because it is necessary or cannot be avoided synonym necessarily
  2. 2 They had perforce to abandon the attempt on the summit.
See the Oxford Advanced Learner's Dictionary entry: perforce