composure
noun /kəmˈpəʊʒə(r)/
  /kəmˈpəʊʒər/
[uncountable]- 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.
 
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.
 
Oxford Collocations Dictionaryadjective- calm
 - cool
 - perfect
 - …
 
- hold
 - keep
 - maintain
 - …
 
- with composure
 
Word Originlate 16th cent. (in the sense ‘composing, composition’): from compose + -ure.