/ Dictionary / Index I interdepartmental: Meaning and Definition of Find definitions for: in•ter•de•part•men•tal Pronunciation: (in"tur-dē"pärt-men'tl, -di-pärt-), [key] — adj. involving or existing between two or more departments: interdepartmental rivalry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: interdepartmental (Thesaurus) interdentil interdependent Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language