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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

Her brother Bladimir Flores was named the parliament’s head of security before becoming the inspector general of the Venezuelan FBI.

From The Wall Street Journal • Mar. 29, 2026

The FBI had no immediate comment on Friday, but a person familiar with the matter confirmed that a personal email account of Patel’s had been breached.

From Los Angeles Times • Mar. 29, 2026

Iranian-backed hackers were reported to have breached Patel's private communications in 2024, weeks before he was appointed to lead the FBI.

From BBC • Mar. 27, 2026

Within two hours of the U-boat landing, the Coast Guard alerted the FBI.

From Nazi Saboteurs by Samantha Seiple

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