something that provides mirth or amusement: A picnic would be fun.
enjoyment or playfulness: She's full of fun.
verb (used without object), verb (used with object), funned, funning.
Informal. joke; kid.
adjective, funner, funnest.
Informal. of or pertaining to fun, especially to social fun: a fun thing to do; really a fun person; the funnest game.
Informal. whimsical; flamboyant: The fashions this year are definitely on the fun side.
for/in fun, as a joke; not seriously; playfully: His insults were only in fun.
like fun, Informal. certainly not; of doubtful truth: He told us that he finished the exam in an hour. Like fun he did!
make fun of, to make the object of ridicule; deride: The youngsters made fun of their teacher.

1675–85; dialectal variant of obsolete fon to befool. See fond1

1, 2. merriment, pleasure, play, gaiety. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fun (fʌn)
1.  a source of enjoyment, amusement, diversion, etc
2.  pleasure, gaiety, or merriment
3.  jest or sport (esp in the phrases in or for fun)
4.  facetious, ironic fun and games amusement; frivolous activity
5.  informal like fun
 a.  (adverb) quickly; vigorously
 b.  (interjection) not at all! certainly not!
6.  make fun of, poke fun at to ridicule or deride
7.  (modifier) full of amusement, diversion, gaiety, etc: a fun sport
vb , funs, funning, funned
8.  informal (intr) to act in a joking or sporting manner
[C17: perhaps from obsolete fon to make a fool of; see fond1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1680s, v., "to cheat, hoax," probably a variant of M.E. fon "befool" (c.1400), later "trick, hoax, practical joke," of uncertain origin. Stigmatized by Johnson as "a low cant word." Older sense is preserved in phrase to make fun of and funny money "counterfeit bills" (1938, though this may be more for
the sake of the rhyme); sense of "amusement" is 1727. See also funny.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Fun definition

A typed lambda-calculus, similar to SOL[2]. "On Understanding Types, Data Abstractions and Polymorphism", L. Cardelli et al, ACM Comp Surveys 17(4) (Dec 1985).

The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Idioms & Phrases


In addition to the idiom beginning with fun, also see for fun; like fun; make fun of; more fun than a barrel of monkeys. Also see under funny.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
There are no helicoptering, happy-fun card-providing parents here.
It will not be a lot of fun being a crime reporter in the capital for the
  foreseeable future.
Moreover, not only can gift-giving add value for the recipient, but it can be
  fun for the giver too.
Others merely think it fun to touch something so bulbous and endangered.
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