'mentally-oriented' originates from the combination of 'mental' and 'oriented', where 'mental' is derived from Latin 'mentalis', meaning 'of the mind', and 'oriented' from Latin 'orientare', meaning 'to arrange or align'.

'mentalis' transformed into the Old French word 'mental', and 'orientare' became 'orienter' in Old French, eventually forming the modern English word 'mentally-oriented'.

Initially, it meant 'aligned with the mind', and over time it evolved into its current meaning of 'focused on mental processes'.