Definition of Federal Bureau of Investigation in US English:

Federal Bureau of Investigation

(also FBI)

proper noun

  • An agency of the US federal government that deals principally with internal security and counter-intelligence and that also conducts investigations in federal law enforcement. It was established in 1908 as a branch of the Department of Justice, but was substantially reorganized under the controversial directorship (1924–72) of J. Edgar Hoover.

Pronunciation

Federal Bureau of Investigation

/ˈfɛd(ə)rəl ˈbjuroʊ əv/