noun
pure reason
Kantian philosophical term; used in discussions of epistemology and metaphysics. Not an everyday word.
カントは『純粋理性批判』で、人間の認識の限界を論じた。
In the Critique of Pure Reason, Kant discussed the limits of human cognition.
Compound of 純粋 (pure) and 理性 (reason), calque of German 'reine Vernunft' from Kantian philosophy.