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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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Department of the Interior, which regulates oil rigs located in federal waters.

From Los Angeles Times • May 11, 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

In a statement, the Department of the Interior said it was pausing five large-sale projects to look into how windmills could interfere with radar and create other risks to east coast cities.

From BBC • Dec. 22, 2025

A spokesperson for the Department of the Interior said they could not respond to the inquiry because of the government shutdown.

From Los Angeles Times • Oct. 29, 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