. "A theory , doctrine , or system based upon reason; science , and (less freq.), subject., knowledge : ratio vivendi ... ratio civilis et disciplina populorum, the art of living ... statesmanship : saltationis ac musicae rationis studiosi, Col. prooem. § 3 al." . "A theory , doctrine , or system based upon reason; science , and (less freq.), subject., knowledge : ratio vivendi ... ratio civilis et disciplina populorum, the art of living ... statesmanship : saltationis ac musicae rationis studiosi, Col. prooem. § 3 al." . .