'affinitive' originates from Latin, specifically the word 'affinitas,' where 'ad-' meant 'to' and 'finis' meant 'boundary' or 'end.'

'affinitas' transformed into the French word 'affinité,' and eventually became the modern English word 'affinity,' from which 'affinitive' is derived.

Initially, it meant 'a relationship by marriage,' but over time it evolved into its current meaning of 'natural attraction or relationship.'