'symmetrically-separated' originates from the combination of 'symmetrical' and 'separated'. 'Symmetrical' comes from the Greek word 'symmetria', where 'syn-' meant 'together' and 'metron' meant 'measure'. 'Separated' comes from the Latin word 'separatus', where 'se-' meant 'apart' and 'parare' meant 'to prepare'.

'symmetria' transformed into the Latin word 'symmetria', and eventually became the modern English word 'symmetrical'. 'Separatus' transformed into the Old French word 'separer', and eventually became the modern English word 'separate'.

Initially, 'symmetrical' meant 'having a common measure', and 'separate' meant 'to divide'. Over time, 'symmetrically-separated' evolved to mean 'divided in a balanced manner'.