noun
Refers to the state of having two fundamental aspects, principles, or natures, often in philosophical or abstract contexts.
この哲学は心と体の二元性を前提としている。
This philosophy presupposes the duality of mind and body.
善と悪の二元性は多くの物語のテーマ
The duality of good and evil is a theme in many stories.
Compound of 二 (two), 元 (origin, principle), and 性 (nature, quality). The term is a modern Sino-Japanese coinage for 'duality'.