serene, self-controlled state of mind; calmness; tranquillity: Despite the hysteria and panic around him, he retained his composure.

1590–1600; compose + -ure

noncomposure, noun

equability, serenity, quiet, coolness, equanimity, self-possession.

agitation. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
composure (kəmˈpəʊʒə)
calmness, esp of the mind; tranquillity; serenity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, with many senses now given to composition or compound, from compose + -ure. Sense of "tranquility, calmness" is first recorded 1660s, from composed "calm" (1620s). For sense, cf. colloquial to fall apart "to lose one's composure."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The weather was stormy, the wind blowing and still it kept its grip and
Unless you are absolutely desperate and able to maintain your composure when
  your doing other work you don't need to do.
Of course there are people who can take losses beyond their means with perfect
  cheerfulness and composure.
He looks fit and keeps his composure admirably as he tries to play scenes with
  obvious amateurs.
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