'affinition' originates from Latin, specifically the word 'affinitio,' where 'ad-' meant 'to' and 'finire' meant 'to finish or end.'

'affinitio' transformed into the Old French word 'affinité,' and eventually became the modern English word 'affinition.'

Initially, it meant 'to bring to an end or completion,' but over time it evolved into its current meaning of 'adding or joining something to another.'