Yin

yin (yin) [Chinese] in Chinese philosophy, the passive, negative, feminine principle that is complementary to yang; see yin, under principle.

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yin,

a polarized aspect of ch′i that is passive or negative energy. See also ch′i, yang.

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yin/yang principle,

in Chinese philosophy, the concept of polar complements existing in dynamic equilibrium and always present simultaneously. In traditional Chinese medicine, a disturbance of the proper balance of yin and yang causes disease, and the goal is to maintain or to restore this balance.

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yin/yang,

a Chinese philosophy that each entity is one, but contains two equal and opposite forces. The forces of yang include maleness, the sun, and heat. The forces of yin include femaleness, darkness, and cold. Macrobiotic diets are based on the division of food into yin and yang properties. Many holistic care practices are rooted in the belief that there must be a balance between yin and yang forces for health and that illness is the result of imbalance.

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Yin

One of the 2 complementary opposite forces of nature, per the ancient Chinese construct of the universe