assumption 2023.03.13 assumptionとは 意味・定義・例文 Noun 名詞 ぁサムプしゃン US /əˈsʌmpʃən/ UK /əˈsʌmpʃᵊn/ 1. something thought to be true but not proved 仮定, 想定, 前提 His actions were based on a false assumption.