Breadcrumb Home > Dictionary > Index D Department of the Interior: Meaning and Definition of Find definitions for: Depart'ment of the Inte'rior Pronunciation: [key] the department of the U.S. federal government charged with the conservation and development of the natural resources of the U.S. and its possessions. Abbr.: DOI Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Department of State Department of the Treasury TrendingHere are the facts and trivia that people are buzzing about. Who's Who in the "Lord of the Rings" Roman Catholic Church Hierarchy Current Events This Week: March 2023 42 Top Western Movie Quotes Slaves in the Family User's Guide to Environmental Language ✖ Related Content Daily Word Quiz: otiose Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language