fun (n.)

"diversion, amusement, mirthful sport," 1727, earlier "a cheat, trick" (c. 1700), from verb fun (1680s) "to cheat, hoax," which is of uncertain origin, probably a variant of Middle English fonnen "befool" (c. 1400; see fond). Scantly recorded in 18c. and stigmatized by Johnson as "a low cant word." Older senses are preserved in phrase to make fun of (1737) and funny money "counterfeit bills" (1938, though this use of the word may be more for the sake of the rhyme). See also funny. Fun and games "mirthful carryings-on" is from 1906.

fun (v.)

1680s, "to cheat;" 1833 "to make fun, jest, joke," from fun (n.). Related: Funning.

fun (adj.)

mid-15c., "foolish, silly;" 1846, "enjoyable," from fun (n.).

updated on January 28, 2015

Definitions of fun from WordNet

fun (n.)
activities that are enjoyable or amusing;
he is fun to have around
I do it for the fun of it
Synonyms: merriment / playfulness
fun (n.)
verbal wit or mockery (often at another's expense but not to be taken seriously);
he became a figure of fun
Synonyms: play / sport
fun (n.)
violent and excited activity;
she asked for money and then the fun began
fun (n.)
a disposition to find (or make) causes for amusement;
he was fun to be with
Synonyms: playfulness
Etymologies are not definitions. From, not affiliated with etymonline.