'Perforce' definitions:

Definition of 'perforce'

(from WordNet)
adverb
By necessity; by force of circumstance

Definition of 'Perforce'

From: GCIDE
  • Perforce \Per*force"\, adv. [F. par (L. per) + force.] By force; of necessity; at any rate. --Shak. [1913 Webster]

Definition of 'Perforce'

From: GCIDE
  • Perforce \Per*force"\, v. t. To force; to compel. [Obs.] [1913 Webster]