noun
clear and distinct; lucid
Primarily a philosophical term, especially in Cartesianism, referring to perceptions or ideas that are both clear and distinct. Also used more generally for having a clear, unclouded mind.
デカルトは明晰判明な認識を真理の基準とした。
Descartes regarded clear and distinct perception as the criterion of truth.
After a night's sleep, my mind became clear and lucid.