/ Dictionary / Index A Anastasius I: Meaning and Definition of Find definitions for: An•as•ta•sius I Pronunciation: (an"u-stā'shus, -shē-us), [key] a.d. c430–518, emperor of the Eastern Roman Empire 491–518. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. anastasis anastigmat Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language