/ Dictionary / Index M missiology: Meaning and Definition of Find definitions for: mis•si•ol•o•gy Pronunciation: (mis"ē-ol'u-jē), [key] — n. Christianity. the theological study of the mission of the church, esp. the character and purpose of missionary work. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. missing mass mission Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language