Department of the Interior
noun
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. Abbreviation: DOI
Cultural definitions for department of the interior
Department of the Interior
A department of the federal executive branch responsible for the National Park Service, the Bureau of Indian Affairs, and a variety of programs designed to preserve natural resources in the United States and its territories and possessions in the Pacific Ocean.