/ Dictionary / Index M missionary apostolic: Meaning and Definition of Find definitions for: mis'sionary apostol'ic Pronunciation: [key] — pl. missionaries apostolic. an honorary title conferred by the pope on certain missionaries. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. missionary missionary position Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language