•Moderately cold; between warm and cold; lacking in warmth; producing or promoting coolness.•Not ardent, warm, fond, or passionate; not hasty; deliberate; exercising self-control; self-possessed; dispassionate; indifferent; as, a cool lover; a cool debater.•Not retaining heat; light; as, a cool dress.•Manifesting coldness or dislike; chilling; apathetic; as, a cool manner.•Quietly impudent; negligent of propriety in matters of minor importance, either ignorantly or willfully; presuming and selfish; audacious; as, cool behavior.•Applied facetiously, in a vague sense, to a sum of money, commonly as if to give emphasis to the largeness of the amount.•A moderate state of cold; coolness; -- said of the temperature of the air between hot and cold; as, the cool of the day; the cool of the morning or evening.•To make cool or cold; to reduce the temperature of; as, ice cools water.•To moderate the heat or excitement of; to allay, as passion of any kind; to calm; to moderate.•To become less hot; to lose heat.•To lose the heat of excitement or passion; to become more moderate.

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