English

Definition of perforce adverb from the Oxford Advanced Learner's Dictionary

 

perforce

 adverb
adverb
BrE BrE//pəˈfɔːs//
 
; NAmE NAmE//pərˈfɔːrs//
 
(old use or formal)
 
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because it is necessary or cannot be avoided synonym necessarily They had perforce to abandon the attempt on the summit. Word Origin Middle English: from Old French par force ‘by force’.
See the Oxford Advanced American Dictionary entry: perforce