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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.

The federal government has redesigned and rebuilt agencies before, including the Consumer Financial Protection Bureau and the Department of Homeland Security.

From Slate • Apr. 23, 2026

Booz Allen gets most of its revenue from contracts with government agencies including the departments of Defense, Veterans Affairs, and Homeland Security, among others.

From Barron's • Apr. 22, 2026

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

Neither ICE nor the Department of Homeland Security immediately responded to a request for comment.

From The Wall Street Journal • Apr. 16, 2026

And thus the prisoners, including Zeitoun, were overseen by the Department of Homeland Security.

From "Zeitoun" by Dave Eggers

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