the word 'truism' is a modern english formation, directly combining the native english adjective 'true' with the classical suffix '-ism'. the adjective 'true' itself has germanic origins, evolving from old english to signify conformity with fact or reality. the suffix '-ism', entering english via latin from greek, is prolific in forming nouns that denote principles or systems. therefore, a 'truism' literally denotes a 'system or principle of truth,' which semantically narrowed to describe a statement whose truth is so obvious and oft-repeated that it has become commonplace and unremarkable.

Structure: true + ism true: from old english trēowe, trȳwe (faithful, trustworthy). functions as the core adjective root conveying the concept of truth. ism: from greek -ismos, a suffix forming nouns of action, state, or doctrine. functions as a noun-forming suffix indicating a distinctive practice, system, or philosophy.