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noun [uncountable] fun pronunciation in American English /fʌn/
  1. enjoyment, especially from an activity that is not important or serious
    have fun: We haven’t had such fun for years.
    great/good fun: We had great fun comparing our baby pictures.
    a lot of fun/lots of fun: The kids had a lot of fun with that old tent.
    a little fun: It was just a little harmless fun.
    1. a.
      an enjoyable activity
      Spending money sure is fun!
      That was fun, wasn’t it?
      Science can be fun.
      be good/great fun: Do come, it’ll be good fun.
    2. b.
      someone who you enjoy spending time with, especially because you enjoy the same activities
      be good/great fun: You’ll love Jamal, he’s great fun.

phrases

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… a feeling of pleasure you get from spending time doing what you want and not worrying about what other people are doing or saying

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