'optimally-separated' originates from the combination of 'optimal' and 'separated', where 'optimal' comes from Latin 'optimus' meaning 'best', and 'separated' from Latin 'separatus', meaning 'to divide'.

'optimally-separated' evolved from the combination of 'optimal' and 'separated', which were used in Middle English as 'optimal' and 'separate', eventually forming the modern English term 'optimally-separated'.

Initially, it meant 'divided in the best way possible', and this meaning has largely remained the same in modern usage.