Meaning

noun an official at a baseball game

noun someone chosen to judge and decide a disputed issue

verb be a referee or umpire in a sports competition

originFrom a Middle English rebracketing of a noumper as an oumper, from Old French nonper (“odd number, not even (as a tie-breaking arbitrator)”), from non (“not”) + per (“equal”), from Latin par (“equal”). Doublet of nonpareil.

Etymology from Wiktionary, CC BY-SA 3.0