'appropriate' originates from Latin, specifically the word 'appropriatus,' where 'ad-' meant 'to' and 'proprius' meant 'own.' 'Separate' originates from Latin, specifically the word 'separatus,' where 'se-' meant 'apart' and 'parare' meant 'to prepare.'

'appropriate' changed from the Old French word 'approprier' and eventually became the modern English word 'appropriate.' 'Separate' transformed from the Latin word 'separatus' and eventually became the modern English word 'separate.'

Initially, 'appropriate' meant 'to make one's own,' but over time it evolved into its current meaning of 'suitable or proper.' 'Separate' initially meant 'to divide or set apart,' and this meaning has largely remained the same in modern usage.