Yin and Yang (j?n) n (Philosophy) two complementary principles of Chinese philosophy: Yin is negative, dark, and feminine, Yang positive, bright, and masculine. Their interaction is thought to maintain the harmony of the universe and to influence everything within it[from Chinese (Peking) yin dark + yang bright]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014yin? and yang? n. (in Chinese philosophy and religion) two principles, one negative, dark, and feminine (yin), and one positive, bright, and masculine (yang), whose interaction influences the destinies of creatures and things. [1930?35;