/ Dictionary / Index J jack arch: Meaning and Definition of Find definitions for: jack' arch" Pronunciation: [key] — Archit. Archit. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. jackanapes jackaroo Related Content Daily Word Quiz: cur Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language