[183] Ratio: Vernunft (s. d.). Vgl. Evolution (DARWIN).
Brockhaus-1911: Ultima ratio regum · Ratio
Eisler-1904: Recta ratio · Ignava ratio
Herder-1854: Ratio · Alterna ratio
Meyers-1905: Ultĭma ratio regum · Ratĭo
Pierer-1857: Subtrīpla ratio · Triplicata ratio · Ratĭo · Subduplicata ratio