/ Dictionary / Index A Antoninus: Meaning and Definition of Find definitions for: An•to•ni•nus Pronunciation: (an"tu-nī'nus), [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: antoninus (Thesaurus) antoninianus Antoninus Pius Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language