yin

/jɪn/
noun
  1. In Chinese philosophy, the passive, dark, female, and negative principle of the universe, which together with yang (the active, bright, male, and positive principle) forms a whole.
    • Many people believe that yin and yang are complementary forces, not opposing ones.
    • The yin represents the cool, dark, and receptive aspects of nature.
    • In traditional Chinese medicine, a balance of yin and yang is essential for good health.
  2. A quality or thing that is opposite or complementary to another, often in a balanced way.
    • The quiet countryside was the perfect yin to the busy city life.
    • Her calm personality is the yin to his energetic yang.
    • In their partnership, his careful planning was the yin to her spontaneous creativity.