'adoptional' originates from the English word 'adoption', which comes from the Latin word 'adoptio', where 'ad-' meant 'toward' and 'optio' meant 'choice'.

'adoptio' transformed into the Old French word 'adoption', and eventually became the modern English word 'adoption', from which 'adoptional' is derived.

Initially, 'adoptio' meant 'to choose or select', but over time it evolved into its current meaning of 'the act of legally taking another's child and bringing it up as one's own'.