'seamlessness' originates from English, specifically formed by adding the noun-forming suffix '-ness' to the adjective 'seamless' (itself 'seam' + suffix '-less').

'seam' comes from Old English 'sēam' (meaning 'seam' or 'join'); the suffix '-less' comes from Old English '-lēas' (meaning 'without'); the suffix '-ness' comes from Old English '-nes(s)e' (forming nouns denoting a state or quality). These elements combined in later English to form 'seamless' and then 'seamlessness'.

Initially used for the literal absence of seams in cloth or material, the term's meaning expanded to include figurative senses of smoothness, continuity, and effortless integration in processes and systems.