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



    BrE BrE//kuːl//
    ; NAmE NAmE//kuːl//
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  1. 1the cool [singular] cool air or a cool place the cool of the evening
  2. 2[uncountable] (informal) The quality of being fashionable, attractive or impressive The ultimate king of cool, Mick Jagger is both elegant and flamboyant. The King of Cool Steve McQueen owned some of the greatest collectible cars of all time.
  3. Word OriginOld English cōl (noun), cōlian (verb), of Germanic origin; related to Dutch koel, also to cold.Idioms (informal) to remain calm in a difficult situation He kept his cool on the convention floor when he was heckled by a young Republican. (informal) to become angry or excited I lost my cool and shouted at them.
See the Oxford Advanced American Dictionary entry: cool