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Department of the Interior

American

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. DOI

Department of the Interior Cultural

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.

Example Sentences

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Department of the Interior

The wildland service, which is part of the US Department of the Interior, was established in January this year to streamline firefighting efforts across public lands.

From BBC ● Jun. 28, 2026

The Department of the Interior has launched a frantic effort to fix the mess.

From Slate ● Jun. 19, 2026

The Department of the Interior said that the turbines may block radar signals External link, based on classified reports.

From Barron's ● Jan. 13, 2026

Department of the Interior, according to communications reviewed by ProPublica and High Country News.

From Salon ● Dec. 4, 2025

Mr. Montsisi and I went back to the Department of the Interior, armed with the visa and other papers from the embassy.

From "Kaffir Boy: An Autobiography" by Mark Mathabane

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023