/ Dictionary / Index C craton: Meaning and Definition of Find definitions for: cra•ton Pronunciation: (krā'ton), [key] — n. Geol. a relatively rigid and immobile region of continental portions of the earth's crust. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: craton (Thesaurus) C ration craunch Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language