Etymology
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yin (n.)

feminine or negative principle in Chinese philosophy, 1670s, from Chinese (Mandarin) yin, said to mean "female, night, lunar," or "shade, feminine, the moon." Compare yang. Yin-yang is from 1850.

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Definitions of yin

yin (n.)
the dark negative feminine principle in Chinese dualistic cosmology;
the interaction of yin and yang maintains the harmony of the universe
From wordnet.princeton.edu