perforce definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
by or through necessity; necessarily
Origin: Middle English par force ; from OFr: see per and amp; force
perforce definition by American Heritage Dictionary
By necessity; by force of circumstance.
Origin: Middle English par force, from Old French : par, by (from Latin per; see per) + force, force; see force.