'unincorporated' originates from the prefix 'un-' meaning 'not' and the word 'incorporated' from Latin 'incorporatus', where 'in-' meant 'into' and 'corporare' meant 'to form into a body'.

'incorporatus' transformed into the English word 'incorporated', and with the addition of the prefix 'un-', it became 'unincorporated'.

Initially, it meant 'not formed into a body or corporation', and this meaning has largely remained the same in modern usage.