/ Dictionary / Index C coetaneous: Meaning and Definition of Find definitions for: co•e•ta•ne•ous Pronunciation: (kō"i-tā'nē-us), [key] — adj. of the same age or duration. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: coetaneous (Thesaurus) coessential coeternal 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