/ Dictionary / Index A adit: Meaning and Definition of Find definitions for: ad•it Pronunciation: (ad'it), [key] — n. an entrance or a passage. Also calleda nearly horizontal passage leading into a mine. an approach or access. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: adit (Thesaurus) Adirondack Mountains Aditya Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language