What is the meaning of fun?

noun

• Activities that are enjoyable or amusing.
  • usage: "I do it for the fun of it"; "he is fun to have around"
  • synonyms: merriment, playfulness
• Verbal wit or mockery (often at another's expense but not to be taken seriously. )
  • usage: "he became a figure of fun"; "he said it in sport"
  • synonyms: play, sport
• Violent and excited activity.
  • usage: "she asked for money and then the fun began"; "they began to fight like fun"
• A disposition to find (or make) causes for amusement.
  • usage: "her playfulness surprised me"; "he was fun to be with"
  • synonyms: playfulness