truismPronunciation: /ˈtruːɪz(ə)m/Translate truism | into German | into Italian Definition of truism noun a statement that is obviously true and says nothing new or interesting:the truism that you get what you pay for Logic a proposition that states nothing beyond what is implied by any of its terms. Derivatives truisticPronunciation: /-ˈɪstɪk/ adjective Spelling helpThere is no e in truism. truism in other Oxford dictionaries Definition of truism in the US English dictionary