Having a slightly low temperature; mildly or pleasantly cold. / Allowing or suggesting heat relief. / Of a color, in the range of violet to green.

A moderate or refreshing state of cold; moderate temperature of the air between hot and cold; coolness. / A calm temperament. / The property of being cool, popular or in fashion.

(intransitive, literally) To lose heat, to get colder. / (transitive, literally) To make cooler, less warm. / (intransitive, figuratively) To become less intense, e.g. less amicable or passionate.

Used other than figuratively or idiomatically: see cool, it. / (informal) Calm down, relax, take a time out.

simple past tense and past participle of cool

Brought to a lower temperature. / Brought to a lower temperature by means of (often in compounds). / Brought to a reduced degree of anger or fervour.

Third-person singular simple present indicative form of coole

(imperative) Used to implore someone to not reveal illegal or improper activity.

(programming) Initialism of CLIPS Object-Oriented Language.

Obsolete spelling of cool