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. Hard Labor Current Events This Week: June 2023 Languages Spoken in Each Country of the World User's Guide to Environmental Language The Washington Monument: Facts, History & Profile LGBT Pride Month | Biographies of Notable Individuals Civilian Labor Force ✖ Related Content Daily Word Quiz: poetaster Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language