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 When temperatures are between 40 degrees and 60 degrees Fahrenheit (five to 15 degrees Celsius), we say it’s cool outside.

  • It’s a little cool outside. You’ll need a jacket.
  • Many people around the world like cool, dry weather.
  • In the United States, the weather usually gets cooler as you head north.
  • The weather starts to cool off in the fall. (This sentence uses "cool" as a verb.)

This word is very popular as an adjective to describe things that are interesting, fun, popular, or new:

  • Jose is wearing a really cool jacket.
  • That movie we saw last night was so cool.
  • Everyone says that Mr. Jones is a cool teacher.
  • He’s so cool!
  • That’s so cool!

cool cat He’s a cool cat!

There are many different ways to use this word:

  • This soup is too hot. It needs to cool off a bit. (cool off = decrease in temperature)
  • Rena was cool to the idea of working late. (She didn’t want to do it.)
  • Tom lost his cool during the meeting. (He got mad. The word "cool" is a noun in this sentence.)
  • Try not to lose your cool. (Try not to get mad.)
  • We’ve decided to cool it for awhile. Things were getting too intense. (cool it = reduce activity)
  • Cool it! (Stop fighting.)
  • I told my boss I needed some vacation time and she was cool with that. (cool with = okay)
  • Are you cool with this? (Is this okay?)

Note: The word "cool" is very popular to describe things, people, and ideas that are new and interesting. It started as a slang word, but now it’s used by just about everybody. It’s a good word to learn about.

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This page was first published on September 11, 2012. It was updated on August 30, 2015.

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