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.

(programming) Initialism of CLIPS Object-Oriented Language.

(uncountable) The state of being cool, i.e. chilly. / (countable) The result or product of being cool, i.e. chilly. / (uncountable) The state of being cool, i.e. calm.

present participle of cool

A decrease in temperature. / Refrigeration.

That cools. / (Asian English). Of food or medicine, according to traditional Chinese medicine: serving to cool or calm the body.

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.