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Homeland Security

¹ British

noun

the United States Department of Homeland Security, the body responsible for dealing with terrorist threats on American soil

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

homeland security ² British

noun

precautions taken by the government of a specified country against terrorist attacks

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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.

Four federal air marshals with the Department of Homeland Security, who were working a security assignment nearby, witnessed the confrontation and rushed in to assist, according to police.

From Los Angeles Times • Apr. 18, 2026

Plus, it could finally force Homeland Security to change its ways, no longer insisting that its agents remain masked and unidentifiable.

From Slate • Apr. 17, 2026

The crackdown on protesters began in June of 2025, when the Department of Homeland Security launched its wave of major immigration sweeps in Southern California.

From Salon • Apr. 15, 2026

The BBC has reached out to the US Department of Homeland Security for comment.

From BBC • Apr. 14, 2026

There were four Maritime Security and Safety Teams, the new Coast Guard tactical units that Homeland Security had formed as part of the War on Terror.

From "Zeitoun" by Dave Eggers

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