noun
mental calmness, composure, and evenness of temper, esp. in a difficult situation : she accepted both the good and the bad with equanimity.
DERIVATIVES
equanimous |iˈkwänəməs| |iˈkwɑnəməs| |əˈkwɑnəməs| |ɪˈkwanɪməs| |iː-| adjective
ORIGIN early 17th cent. (also in the sense ‘fairness, impartiality’ ): from Latin aequanimitas, from aequus ‘equal’ + animus ‘mind.’