Definition: Fun (fŭn) [fuhn] noun 1. A source of enjoyment, amusement, or pleasure. 2. Playful, often noisy, activity.
idioms 1. for or in fun, as a joke; not seriously; playfully 2. like fun, Informal. certainly not; of doubtful truth 3. make fun of, to make the object of ridicule; deride
Origin: 1675–85; dial. var. of obs. fon to befool.