English definition of “fun”
/fʌn/ noun [U]
› enjoyment or pleasure, or something that gives you enjoyment or pleasure: You'll like it - it's good fun! She's great fun to be with. Have fun! (= enjoy yourself) It's no fun having to work late every night.
for fun/for the fun of it › for pleasure and not for any other reason
make fun of sb/sth › to make a joke about someone or something in an unkind way: The other children at school used to make fun of his hair.