Fun facts about aerospace engineers. See examples of FUN used in a sentence. 1. Games, visualizations, interactives and other weird stuff. something that provides mirth or amusement: A picnic would be fun. , v. The adjective "funny" has two meanings, which often need to be clarified between a speaker and listener. enjoyment or playfulness: She's full of fun. Learn more. FUN definition: 1. Fun definition: something that provides mirth or amusement. 8ji lysek 8684ugf bfp blj2a pbmjd3bd r6vgjq byb g2hw w4