1. neither warm nor very cold; moderately cold: fresh, cool water; a cool autumn evening.
2. giving or suggesting relief from heat: a cool breeze; a cool blouse.
3. marked by calm self-control: a cool negotiator.
4. marked by indifference, disdain, or dislike; unfriendly or unresponsive: a cool greeting; was cool to the idea of higher taxes.
5. of, relating to, or characteristic of colors, such as blue and green, that produce the impression of coolness.
6. slang excellent; first-rate: has a cool sports car; had a cool time at the party.
7. slang acceptable; satisfactory: it's cool if you don't want to talk about it.
8. slang entire; full: worth a cool million.
9. informal in a casual manner; nonchalantly: play it cool.
10. to make less warm.
11. to make less ardent, intense, or zealous: problems that soon cooled my enthusiasm for the project.
12. physics to reduce the molecular or kinetic energy of (an object).
13. to become less warm: took a dip to cool off.
14. to become calmer: needed time for tempers to cool.
15. A cool place, part, or time: the cool of early morning.
16. the state or quality of being cool.
17. composure; poise: "our release marked a victory. the nation had kept its cool” ( Moorhead kennedy).
18. cool it slang to calm down; relax.
19. cool it slang to stop doing something.
20. cool (one's) heels informal to wait or be kept waiting.

1. having a slightly low temperature; mildly or pleasantly cold.
2. allowing or suggesting heat relief
3. of a person, not showing emotion, calm and in self-control.
4. unenthusiastic, lukewarm, skeptical.
5. calmly audacious.
6. of a person, knowing what to do and how to behave; considered popular by others.
7. in fashion, part of or fitting the in-crowd, originally hipster slang.
8. of an action, all right; acceptable; that does not present a problem.
9. A dismissal of a comment perceived as boring or pointless.
10. of a person, not upset by circumstances that might ordinarily be upsetting.
11. A moderate or refreshing state of cold; moderate temperature of the air between hot and cold; coolness.
12. (intransitive) to lose heat, to get colder.
13. to make cooler, less warm
14. (intransitive) to become less intense, e.g. less amicable.
15. to make less intense, e.g. less amicable.

1. moderately cold; between warm and cold; lacking in warmth; producing or promoting coolness.
2. not ardent, warm, fond, or passionate; not hasty; deliberate; exercising self-control; self-possessed; dispassionate; indifferent.
3. not retaining heat; light.
4. manifesting coldness or dislike; chilling; apathetic.
5. quietly impudent; negligent of propriety in matters of minor importance, either ignorantly or willfully; presuming and selfish; audacious.
6. applied facetiously, in a vague sense, to a sum of money, commonly as if to give emphasis to the largeness of the amount.
7. A moderate state of cold; coolness; -- said of the temperature of the air between hot and cold.
8. to become less hot; to lose heat.
9. to lose the heat of excitement or passion; to become more moderate.
10. to make cool or cold; to reduce the temperature of.
11. to moderate the heat or excitement of; to allay, as passion of any kind; to calm; to moderate.

1. moderately cold; being of a temperature neither warm nor very cold: as, cool air; cool water.
2. having a slight or not intense sensation of cold. see cold, a., 3.
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.
4. in figurative uses:
5. not excited or heated by passion of any kind; without ardor or visible emotion; calm; unmoved: as, a cool temper; a cool lover.
6. not hasty; deliberate: as, a cool purpose.
7. manifesting coldness, apathy, or dislike; chilling; frigid: as, a cool manner.
8. quietly impudent, defiant, or selfish; deliberately presuming: said of persons and acts.
9. absolute; without qualification; round: used in speaking of a sum of money, generally a large sum, by way of emphasizing the amount.
10. unconcerned, lukewarm, indifferent; cold-blooded, repellent
11. to make cool or cold; reduce the temperature of: as, ice cools water.
12. to allay the warmth or heated feeling of; impart a sensation of coolness to; cause to feel cool.
13. 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.
14. to mitigate.
15. to become cool; become less hot; lose heat.
16. to lose the heat of excitement, passion, or emotion; become less ardent, angry, zealous, affectionate, etc.; become more moderate.
17. in painting, to strengthen (colors) on the blue and violet side of the spectrum, or to reduce (reds and yellows).
18. A moderate or refreshing state of cold; moderate temperature of the air between hot and cold.
19. an obsolete spelling of cole.

1. psychologically cool and unenthusiastic; unfriendly or unresponsive or showing dislike
2. make cool or cooler
3. lose intensity
4. fashionable and attractive at the time; often skilled or socially adept
5. marked by calm self-control (especially in trying circumstances); unemotional
6. great coolness and composure under strain
7. (color) inducing the impression of coolness; used especially of greens and blues and violets
8. (used of a number or sum) without exaggeration or qualification
9. neither warm nor very cold; giving relief from heat
10. the quality of being at a refreshingly low temperature
11. loose heat