Etymology
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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.

updated on September 03, 2014

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Definitions of equanimity from WordNet

equanimity (n.)
steadiness of mind under stress;
he accepted their problems with composure and she with equanimity
Synonyms: composure / calm / calmness
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.