/ Dictionary / Index I in-joke: Meaning and Definition of Find definitions for: in-joke Pronunciation: (in'jōk"), [key] — n. a joke that can be understood or appreciated only by the members of a limited group of people. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: in-joke (Thesaurus) injector injudicious Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language