noun, plural ar·bi·trar·ies.
Origin of arbitrary
British Dictionary definitions for unarbitrary
Word Origin for arbitrary
Word Origin and History for unarbitrary
early 15c., "deciding by one's own discretion," from Old French arbitraire (14c.) or directly from Latin arbitrarius "depending on the will, uncertain," from arbiter (see arbiter). The original meaning gradually descended to "capricious" and "despotic" (1640s). Related: Arbitrarily; arbitrariness.