humanity noun hu·​man·​i·​ty | \ hyü-ˈma-nə-tē , yü- \ plural humanities Definition of humanity 1 : compassionate, sympathetic, or generous behavior or disposition : the quality or state of being humane bespeaking humanity for the enemy in the midst of a bloody struggle — C. G. Bowers 2a : the quality or state of being human joined together by their common humanity. Webster’s Dictionary