'allocatable' originates from the verb 'allocate', which comes from the Latin word 'allocare', where 'ad-' meant 'to' and 'locare' meant 'to place'.

'allocare' transformed into the French word 'allouer', and eventually became the modern English word 'allocate' through Middle English.

Initially, it meant 'to place or assign something', and this meaning has largely remained the same in modern usage.