Added 10 October 2026 amphitheater noun Categories: ThingsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about amphitheater at Wordnik → Where our words come from → A sloping gallery with seats for spectators (as in an operating room or theater). An oval large stadium with tiers of seats; an arena in which contests and spectacles are held. Related Words: amphitheatrecoliseumarenaovalauditoriumbandshellgazebopavilionbandstandvenuestadiumgrandstand Back to today's word