'unallocability' originates from English, specifically formed from the prefix 'un-' and the noun 'allocability', where 'un-' meant 'not' and 'allocability' meant 'the quality of being able to be allocated.'

'unallocability' changed from the noun 'allocability' which derives from the verb 'allocate' (Middle English and Modern English), and 'allocate' in turn comes from Latin 'allocare' (from ad- 'to' + locare 'to place'), and the negative prefix 'un-' was attached in English to form 'unallocability'.

Initially, components like 'allocate' meant 'to place or assign (something)', and over time the derived compound 'unallocability' came to mean specifically 'the state of not being able to be allocated' in modern usage.