'rational' originates from Latin, specifically the word 'rationalis,' where 'ratio' meant 'reason.' 'Focus' originates from Latin, specifically the word 'focus,' meaning 'hearth' or 'center.'

'rational' changed from the Latin word 'rationalis' and eventually became the modern English word 'rational.' 'Focus' transformed from the Latin word 'focus' and became the modern English word 'focus.'

Initially, 'rational' meant 'pertaining to reason,' and 'focus' meant 'center.' Over time, 'rational-focused' evolved to mean 'concentrated on logical reasoning.'