Moderately cold; being of a temperature neither warm nor very cold: as, cool air; cool water.Having a slight or not intense sensation of cold. See cold, a., 3.Not producing heat or warmth; permitting or imparting a sensation of coolness; allowing coolness, especially by facilitating radiation of heat or access of cool air, or by intercepting radiated heat: as, a cool dress.In figurative uses:Not excited or heated by passion of any kind; without ardor or visible emotion; calm; unmoved: as, a cool temper; a cool lover.Not hasty; deliberate: as, a cool purpose.Manifesting coldness, apathy, or dislike; chilling; frigid: as, a cool manner.Quietly impudent, defiant, or selfish; deliberately presuming: said of persons and acts.Absolute; without qualification; round: used in speaking of a sum of money, generally a large sum, by way of emphasizing the amount.Unconcerned, lukewarm, indifferent; cold-blooded, repellentn. A moderate or refreshing state of cold; moderate temperature of the air between hot and cold.To make cool or cold; reduce the temperature of: as, ice cools water.To allay the warmth or heated feeling of; impart a sensation of coolness to; cause to feel cool.To abate the ardor or intensity of; allay, as passion or strong emotion of any kind; calm, as anger; moderate, as desire, zeal, or ardor; render indifferent.To mitigate.To become cool; become less hot; lose heat.To lose the heat of excitement, passion, or emotion; become less ardent, angry, zealous, affectionate, etc.; become more moderate.n. An obsolete spelling of cole.In painting, to strengthen (colors) on the blue and violet side of the spectrum, or to reduce (reds and yellows).