'symmetrically-furnished' originates from the combination of 'symmetrical' and 'furnished'. 'Symmetrical' comes from the Greek word 'symmetria', where 'syn-' meant 'together' and 'metron' meant 'measure'. 'Furnished' comes from the Old French word 'furnir', meaning 'to supply or provide'.

'Symmetrical' evolved from the Greek 'symmetria' to the Latin 'symmetria', and eventually became the modern English word 'symmetrical'. 'Furnished' transformed from the Old French 'furnir' to the Middle English 'furnishen', and eventually became 'furnished'.

Initially, 'symmetrical' meant 'having a common measure', but over time it evolved into its current meaning of 'balanced and proportionate'. 'Furnished' originally meant 'to supply', and this meaning has largely remained the same in modern usage.