/ Dictionary / Index K Koestler: Meaning and Definition of Find definitions for: Koest•ler Pronunciation: (kest'lur, kes'lur), [key] — n. 1905–83, British novelist, critic, and journalist; born in Hungary. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: koestler (Thesaurus) koel kof Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language