/ Dictionary / Index V Valentinian I: Meaning and Definition of Find definitions for: Val•en•tin•i•an I Pronunciation: (val"un-tin'ē-un), [key] a.d.321?–375, emperor of Western Roman Empire 364–375. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Valentine Day Valentinian II Related Content Daily Word Quiz: slough Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language