Department of Transportation

American

noun

the department of the U.S. federal government that coordinates and institutes national transportation programs. DOT

Department of Transportation Cultural

A department of the federal executive branch responsible for the national highways and for railroad and airline safety. It also manages Amtrak, the national railroad system, and the Coast Guard.

Example Sentences

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Department of Transportation

Back in Washington, the Department of Transportation concluded that this laissez-faire attitude had to change, and began high-level discussions with the nation’s aviation executives.

From Slate ● Jul. 7, 2026

The research was funded by the Hawaii Department of Transportation.

From Science Daily ● Jun. 28, 2026

File a complaint with the Department of Transportation at airconsumer.dot.gov.

From MarketWatch ● Jun. 23, 2026

The Arizona Department of Transportation is widely seen as having a more welcoming regulatory environment for autonomous trucking companies than other states.

From The Wall Street Journal ● Jun. 8, 2026

“The bowstring bridge at Delhi is next,” Joe Cassini said on a cellular phone to his boss at the Department of Transportation in Albany.

From "Frightful's Mountain" by Jean Craighead George

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