Etymology
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composure (n.)

c. 1600, "composition, act of composing, constructing, arrangement" (also, in early use, with many senses now given to compound (n.2)), from compose + -ure. Sense of "tranquility, calmness, composed state of mind" is first recorded 1660s, from composed "calm" (c. 1600). For sense, compare colloquial fall apart "lose one's composure."

updated on February 16, 2018

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Definitions of composure from WordNet

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