'nonrepetitiveness' originates from Modern English, formed by the prefix 'non-' (from Latin 'non' meaning 'not') added to 'repetitiveness' (repetitive + the noun-forming suffix '-ness').

'repetitiveness' developed from the adjective 'repetitive' + the Old English/Proto-Germanic-derived suffix '-ness'; 'repetitive' itself descends from Late Latin 'repetitivus' (from Latin 'repetere' meaning 'to repeat'), which entered English via French/Latin influence in Middle/Modern English.

The component elements originally meant 'not' + 'to repeat'; over time they were combined in Modern English to name the abstract property 'absence of repetition' rather than a strictly verbal action.