fun noun definition in Happiness topic from the Oxford Advanced Learner's Dictionary

fun

 noun: Happiness topic
enjoyment; pleasure; a thing that gives enjoyment or pleasure and makes you feel happy We had a lot of fun at Sarah's party. Sailing is good fun. Have fun! (= Enjoy yourself) I decided to learn Spanish, just for fun. I didn't do all that work just for the fun of it. It's not much fun going to a party on your own. ‘What fun!’ she said with a laugh. Walking three miles in the pouring rain is not my idea of fun. The whole family can join in the fun at Water World. ‘What do you say to a weekend in New York?’ ‘Sounds like fun.’