equanimity
n.
c.1600, "fairness, impartiality," from French équanimité, from Latin aequanimitatem (nominative aequanimitas) "evenness of mind, calmness; good-will, kindness," from aequanimis "mild, kind," literally "even-minded," from aequus "even, level" (see equal, adj.) + animus "mind, spirit" (see animus). Meaning "evenness of temper" in English is from 1610s.
〔蒋〕[equ平，anim心神，-ity名词后缀；“心神平静”] 沉着，平静，镇定
〔李〕[equ=even平衡的；anim=spirit精神；-ity n.=the quality表性质→“the spirit with an even quality平稳的精神品质”→] n. calmness or steadiness of mind沉着；镇定