Aplomb

[ə'plɒm] or [ə'plɑm]

(noun.) great coolness and composure under strain; 'keep your cool'.

Inputed by Jill--From WordNet

(n.) Assurance of manner or of action; self-possession.

Checker: Lucille

n. the perpendicular perpendicularity: self-possession coolness.

Editor: Peter