Definition of composure noun from the Oxford Advanced Learner's Dictionary

 

composure

 noun
noun
BrE BrE//kəmˈpəʊʒə(r)//
 
; NAmE NAmE//kəmˈpoʊʒər//
 
[uncountable]
 
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the state of being calm and in control of your feelings or behaviour to keep/lose/recover/regain your composure He maintained his composure despite a desperate desire to laugh. Word Origin late 16th cent. (in the sense ‘composing, composition’): from compose + -ure.Extra examples She answered with perfect composure. She closed her eyes for a moment, to gather her composure. She totally lost her composure and began shouting.
See the Oxford Advanced American Dictionary entry: composure