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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.

In court filings, county attorneys representing the Sheriff’s Department argue that several of the documents — such as FBI policies and internal procedures and training methods — are “sensitive and restricted.”

From Los Angeles Times • 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

A hacking group linked to Iran published information from FBI Director Kash Patel’s personal email account Friday.

From Salon • Mar. 27, 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

Dad and Aunt Melissa walk straight toward the FBI agents and I sprint across the grass.

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