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

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FBI

Byte Spies: The FBI disrupted a China-linked hacking operation that broke into U.S. government networks and critical infrastructure, while hiding its tracks on a global network of hacked devices, cloud-computing infrastructure and even clandestine networks.

From The Wall Street Journal ● Aug. 30, 2026

The FBI continued to build a case against him, however.

From BBC ● Aug. 29, 2026

“I know a con man when I see one,” says Mr. Rogers, who was a special agent with the FBI from 1989 through 1994.

From The Wall Street Journal ● Aug. 28, 2026

A US military judge ruled Friday that confessions made by alleged 9/11 attacks mastermind Khalid Sheikh Mohammed to FBI agents are inadmissible and cannot be used against him at trial, The New York Times reported.

From Barron's ● Aug. 28, 2026

Dad gave us strict instructions—instructions I’m quite certain were relayed to him by the FBI: Don’t communicate with Mom.

From "South of Somewhere" by Kalena Miller

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