(idiomatic) to act cool

plural of cool kid

(idiomatic) calm and composed in a difficult situation.

(physics) The cooling of a liquid due to the removal of the faster-moving molecules by evaporation from its surface

(physics) The cooling of a gas as it undergoes adiabatic expansion

A system for centralized removal of heat for residential and commercial cooling requirements.

(idiomatic) A calm, focused demeanor and mindset; a person having such characteristics.

(slang) Extremely cool.

(obsolete) Something that dashes hopes.

(sociology) A tough, fearless, aloof attitude said to be adopted by black men as a coping mechanism to deal with racial oppression.