'incontrovertibility' originates from Latin and Old French, specifically from Latin 'incontrovertibilis' and Old French 'incontrovertible', where 'in-' meant 'not' and Latin 'controvertere' meant 'to turn against' or 'to dispute'.

'incontrovertibility' changed from Latin 'incontrovertibilis' to Old French 'incontrovertible' and eventually became the modern English word 'incontrovertibility' by the addition of the noun-forming suffix '-ity' in Late Middle English and Early Modern English.

Initially it meant 'not able to be turned against or disputed' in a literal sense, and over time it evolved into its current meaning of 'the quality of being indisputable or beyond dispute'.