cool

adj

1. Of a mildly low temperature.

   “I like cool weather the most 'cause it's not too hot to wear a jacket but I won't be too cold in my shorts.”

   “The day was cool and snappy for August, and the Rise all green with a lavish nature. Now we plunged into a deep shade with the boughs lacing each other overhead, and crossed dainty, rustic bridges over the cold trout-streams, the boards giving back the clatter of our horses' feet:[…].”

   “Many exoplanets have been found orbiting dwarf stars that are much cooler and smaller than our sun, such as the famed TRAPPIST-1 system and its seven planets, announced in 2017.”

2. Allowing or suggesting heat relief.

   “Linen has made cool and breathable clothing for millennia.”

   “Now that she had rested and had fed from the luncheon tray Mrs. Broome had just removed, she had reverted to her normal gaiety. She looked cool in a grey tailored cotton dress with a terracotta scarf and shoes and her hair a black silk helmet.”

3. Of a color, in the range of violet to green.

   “If you have a reddish complexion, you should mainly wear cool colors.”

4. Not showing emotion; calm and in control of oneself.

   “Be cool. There's no need to panic.”

5. Unenthusiastic; lukewarm; skeptical.

   “His proposals had a cool reception.”

6. (obsolete)Calmly audacious.

   “Its cool stare of familiarity was intolerable.”

   “In that supposed event, you say, you will destroy the Union; and then, you say, the great crime of having destroyed it will be upon us! That is cool.”

   “"Well, that's cool," said Laurie to himself, "to have a picnic and never ask me!"”

7. Applied facetiously to a sum of money, commonly as if to give emphasis to the largeness of the amount.

   “Who will lend me a cool hundred.”

   “But she had wrote out a little coddleshell in her own hand a day or two afore the accident, leaving a cool four thousand to Mr. Matthew Pocket.”

   “You remember Bulger, don't you? You lost a cool hundred to him one night here over the cards, eh?”

   “My father was talking to the World's Fair Commission yesterday, and they estimate it's going to cost a cool fifty million.”

8. (informal)Knowing what to do and how to behave; behaving with effortless and enviable style and panache; considered popular by others.

   “[…] while the coachman holding whip and reins in one hand, takes off his hat with the other, and resting it on his knees, pulls out his handkerchief, and wipes his forehead, partly because he has a habit of doing it, and partly because it's as well to shew the passengers how cool he is, and what an easy thing it is to drive four-in-hand, when you have had as much practice as he has.”

   “Maggie the au pair, and Pam P. on the school bus and Billy G. with his Grateful Dead records were all deeply cool people. But they weren’t cool because they smoked. They smoked because they were cool.”

   “He managed to conduct interviews with the least cool global figure – his father, Prince Charles – and the most cool, Barack Obama, in a way that allowed them both to look as good as they could.”

   “Is there a secret sauce that helps explain why people as different as David Bowie, Samuel L. Jackson and Charli XCX all seem so self-assured and, well, cool? A new study suggests that there are six specific traits that these people tend to have in common: Cool people are largely perceived to be extroverted, hedonistic, powerful, adventurous, open and autonomous.”

9. (informal)Fashionable; trendy; hip.

   “2008, Lou Schuler, "Foreward", in Nate Green, Built for Show, page xii The fact that I was middle-aged, bald, married, and raising girls instead of chasing them didn't really bother me. Muscles are cool at any age.”

10. (informal)All right; acceptable; good.

    “Is it cool if I sleep here tonight?”

    “Now everything's cool, Drac's a part of the band / And my Monster Mash is the hit of the land / For you, the living, this Mash was meant too / When you get to my door, tell them Boris sent you.”

11. (informal)Very interesting or exciting.

    “I think astronomy is really cool.”

12. (informal)Followed by with: able to tolerate.

    “I'm completely cool with my girlfriend leaving me.”

13. (informal)Of a pair of people, Having good relations.

    “We're cool, right?”

noun

1. (uncountable)A moderate or refreshing state of cold; moderate temperature of the air between hot and cold; coolness.

   “in the cool of the morning”

2. (uncountable)A calm temperament.
3. (uncountable)The property of being cool, popular or in fashion.

verb

1. (intransitive, literally)To lose heat, to get colder.

   “I like to let my tea cool before drinking it so I don't burn my tongue.”

2. (literally, transitive)To make cooler, less warm.

   “Send Lazarus, that he may dip the tip of his finger in water, and cool my tongue.”

3. (figuratively, intransitive)To become less intense, e.g. less amicable or passionate.

   “Relations cooled between the USA and the USSR after 1980.”

4. (figuratively, transitive)To make less intense, e.g. less amicable or passionate.

   “We have reason to cool our raging motions, our carnal stings, our unbitted lusts.”

5. (dated, slang, transitive)To kill, murder.

   “Maybe he would die. That would mean I had murdered him. I smiled, trying the idea on for size. One of the things that always had cheesed me a little was that I had no kills to my credit. I'd been in plenty of rumbles, but somehow, I'd never cooled anyone. Well maybe now I had my first one. I couldn't feel very proud of skulling an old man, but at least I could say that I'd scored. That was a big kick.”

   “Big-mouth got up as fast as he could, and I was thinking how much heart he had. But I ran toward him like my life depended on it; I wanted to cool him.”

6. (intransitive, slang)To relax, hang out.

   “Seen my homeboys coolin' way way out / Told 'em bout my mornin' cold bugged' em out”

   “"What up, kid?" ¶ "Coolin'."”

   “Asbestos? Raa, dat's a dangerous t'ing boy, dat ain't good. You know what though, you guys should min' yourselves walkin' street star, dere's bere nutters about. I know you're in a crew but boy can't you jus' cool' at someone's house?'”

name

1. (abbreviation, alt-of, initialism)Initialism of CLIPS Object-Oriented Language.
2. A surname.
3. (abbreviation, alt-of, ellipsis)A surname.