'fully-divided' originates from the combination of 'fully' and 'divide', where 'fully' means 'completely' and 'divide' means 'to separate into parts'.

'fully-divided' evolved from the Old English word 'fylle' meaning 'full' and the Latin word 'dividere' meaning 'to separate'.

Initially, it meant 'completely separated', and this meaning has largely remained the same in modern usage.