/ Dictionary / Index C Christendom: Meaning and Definition of Find definitions for: Chris•ten•dom Pronunciation: (kris'un-dum), [key] — n. Christians collectively. the Christian world. Christianity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: christendom (Thesaurus) christen christening Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language