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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.

Some of the cases shut down were the result of yearslong investigations by federal agencies such as the FBI and the Drug Enforcement Administration.

From Salon • Apr. 1, 2026

The late FBI director Robert Mueller is often quoted as saying: “There are two types of companies: those that have been hacked and those that will be hacked.”

From The Wall Street Journal • Mar. 31, 2026

The FBI, National Security Council, state department, Delta Force and the Iraqi Counter-Terrorism Service were in contact about her abduction, sources familiar told CBS.

From BBC • Mar. 31, 2026

According to the outlet, it’s highly unusual for the FBI to release case files tied to a probe that did not result in criminal charges.

From Los Angeles Times • Mar. 29, 2026

“The FBI took our house already. I’m not giving up Instagram too.”

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