/ Dictionary / Index J jack Mormon: Meaning and Definition of Find definitions for: jack' Mor"mon Pronunciation: [key] a non-Mormon living amicably among Mormons. a Mormon not active in the church or adhering strictly to Mormon principles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jack mackerel jack oak Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language