'historically-disconnected' originates from the combination of 'historically' and 'disconnected'. 'Historically' comes from 'history', which originates from Greek 'historia', meaning 'inquiry, knowledge acquired by investigation'. 'Disconnected' comes from 'disconnect', which originates from Latin 'dis-' meaning 'apart' and 'connect', from Latin 'connectere', meaning 'to bind together'.

'Historically-disconnected' is a modern English term formed by combining 'historically' and 'disconnected'.

Initially, 'disconnected' meant 'not connected', and 'historically' meant 'in a manner relating to history'. Together, they evolved to describe something lacking historical continuity.