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FBI

American

[ef-bee-ahy] / ˈɛfˈbiˈaɪ /

noun

U.S. Government.

Federal Bureau of Investigation: the federal agency charged with investigations for the Attorney General and with safeguarding national security.

FBI British

abbreviation

Federal Bureau of Investigation; an agency of the Justice Department responsible for investigating violations of Federal laws

"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.

Before the FBI interrogated him, they asked him to sign a piece of paper.

From Slate • Apr. 19, 2026

Enforcement actions continued throughout 2025 with multiple arrests reported by the FBI and the California Highway Patrol.

From Los Angeles Times • Apr. 18, 2026

Police and FBI agents showed up to supplement the private guards, even though Harsimran Singh never filed a formal complaint with them.

From Los Angeles Times • Apr. 18, 2026

The FBI is continuing to investigate the case, with three other defendants - all based in America and in their 20s - also facing criminal charges.

From BBC • Apr. 17, 2026

The FBI tracked him down, knocking on the door early on the morning of June 21, 1957.

From "Fallout: Spies, Superbombs, and the Ultimate Cold War Showdown" by Steve Sheinkin

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