/ Dictionary / Index J Justinian I: Meaning and Definition of Find definitions for: Jus•tin•i•an I Pronunciation: ( ju-stin'ē-un), [key] — (Flavius Anicius Justinianus) (“Justinian the Great”) a.d. 483–565, Byzantine emperor 527–565. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Justine Justinian Code Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language