[fun] n [E dial. fun to hoax, perh. alter. of ME fonnen, fr. fonne dupe] (1727) 1: what provides amusement or enjoyment; specif: playful often boisterous action or speech "full of ~"
2: a mood for finding or making amusement "all in ~" 3 a: amusement, enjoyment "sickness takes all the ~ out of life" b: derisive jest: sport, ridicule "a figure of ~"
4: violent or excited activity or argument "let a snake loose in the classroom; then the ~ began" syn fun, jest, sport, game, play mean action or speech that provides amusement or arouses laughter. fun usu. implies laughter or gaiety but may imply merely a lack of serious or ulterior purpose "played cards just for fun". jest implies lack of earnestness in what is said or done and may suggest a hoaxing or teasing "hurt by remarks said only in jest". sport applies esp. to the arousing of laughter against someone "teasing begun in sport led to anger". game is close to sport, and often stresses mischievous or malicious fun "made game of their poor relations". play stresses the opposition to earnest without implying any element of malice or mischief "pretended to strangle his brother in play".
[2]fun vi funned ; fun.ning (1833): to indulge in banter or play: joke [3]fun adj, sometimes fun.ner sometimes fun.nest (ca. 1846) 1: providing entertainment, amusement, or enjoyment "a ~ party" "a ~ person to be with"
2: full of fun: pleasant "a ~ night" "have a ~ time"