| Noun | 1. | yin - the dark negative feminine principle in Chinese dualistic cosmology; "the interaction of yin and yang maintains the harmony of the universe"principle, rule - a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct; "their principles of composition characterized all their works" yang - the bright positive masculine principle in Chinese dualistic cosmology; "yin and yang together produce everything that comes into existence" | |