composure

Etymology

From compose + -ure.

noun

1. Calmness of mind or temperament
   He began to lose his composure, and made mistakes, his cards got mixed up, and his scoring was wild. 1894, Giacomo Casanova, chapter 16, in Arthur Machen, transl., The Memoirs of Jacques Casanova de Seingalt, volume 4, London: Elek Books, page 407
   Montenegro's early composure was shaken by that set-back and a visibly buoyed Wales nearly added a second goal when Bale broke past two defenders and fired a long-range shot that Bozovic tipped over September 2, 2011, “Wales 2-1 Montenegro”, in BBC
2. (obsolete) The act of composing
   1818, John Evelyn, Memoirs, edited by William Bray, London: Henry Colburn, 2nd edition, Volume I, entry for 10 March, 1685, p. 592, […] Signʳ Pietro […] had an admirable way both of composure [in music] and teaching.
3. (obsolete) Something which is composed; a composition.
4. (obsolete) Orderly adjustment; disposition.
   […] from the various Composures and Combinations of these Corpusoles together, happen all the Varieties of the Bodies formed out of them […] 1695, John Woodward, An Essay toward a Natural History of the Earth and Terrestrial Bodies, London: Richard Wilkin, Part 5, p. 230
5. (obsolete) Frame; make; temperament.
6. (obsolete) A combination; a union; a bond.