<p><strong>Adjective</strong></p><ul><li>moderately cold; neither warm nor cold: a rather cool evening.</li><li>feeling comfortably or moderately cold: I'm perfectly cool, but open the window if you feel hot.</li><li>imparting a sensation of moderate coldness or comfortable freedom from heat: a cool breeze.</li><li>permitting such a sensation: a cool dress.</li><li>not excited; calm; composed; under control: to remain cool in the face of disaster.</li><li>not hasty; deliberate: a cool and calculated action.</li><li>lacking in interest or enthusiasm: a cool reply to an invitation.</li><li>lacking in warmth or cordiality: a cool reception.</li><li>calmly audacious or impudent: a cool lie.</li><li>aloof or unresponsive; indifferent: He was cool to her passionate advances.</li><li>unaffected by emotions; disinterested; dispassionate: She made a cool appraisal of all the issues in the dispute.</li><li>(of a number or sum) without exaggeration or qualification: a cool million dollars.</li><li>(of colors) with green, blue, or violet predominating.</li><li>Slang: great; fine; excellent: a real cool comic.</li><li>characterized by great facility; highly skilled or clever: cool maneuvers on the parallel bars.</li><li>socially adept: It's not cool to arrive at a party too early.</li><li>acceptable; satisfactory; okay: If you want to stay late, that's cool.</li></ul><p><strong>Adverb</strong></p><ul><li>Informal: coolly.</li></ul><p><strong>Interjection</strong></p><ul><li>Slang: (used to express acceptance): Okay, cool! I'll be there at 10:00.</li><li>(used to express approval, admiration, etc.): He got the job? Cool!</li></ul><p><strong>Noun</strong></p><ul><li>something that is cool; a cool part, place, time, etc.: in the cool of the evening.</li><li>coolness.</li><li>calmness; composure; poise: an executive noted for maintaining her cool under pressure.</li></ul><p><strong>Verb</strong></p><ul><li>(used without object) to become cool (sometimes followed by down or off): The soup cooled in five minutes.</li><li>We cooled off in the mountain stream.</li><li>to become less ardent, cordial, etc.; become moderate.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to make cool; impart a sensation of coolness to.</li><li>to lessen the ardor or intensity of; allay; calm; moderate: Disappointment cooled his early zealousness.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>Informal: to become calmer or more reasonable: Wait until he cools off before you talk to him again.</li></ul>