/ Dictionary / Index C Constans I: Meaning and Definition of Find definitions for: Con•stans I Pronunciation: (kon'stanz), [key] — (Flavius Julius Constans) a.d. c323–350, emperor of Rome 337–350 (son of Constantine I). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. constancy constant Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language