Entry 2 senses · 2 variants Webster, 1913 Fun /(fŭn)/ · IPA /fʌn/ n. adj. 01 n. Sport; merriment; frolicsome amusement. 1. Sport; merriment; frolicsome amusement. Phrases & compounds To make fun of — to hold up to, or turn into, ridicule. 02 adj. Of or pertaining to fun; causing pleasure or amusement; as, a fun thing to do. 1. Of or pertaining to fun; causing pleasure or amusement; as, a fun thing to do.(colloquial or jocular)