WordReference Random House Learner's Dictionary of American English © 2017
FBI,  an abbreviation of:
  1. GovernmentFederal Bureau of Investigation.

WordReference Random House Unabridged Dictionary of American English © 2017
FBI, [U.S. Govt.]
  1. GovernmentFederal Bureau of Investigation: the federal agency charged with investigations for the Attorney General and with safeguarding national security.

Collins Concise English Dictionary © HarperCollins Publishers::

FBI abbreviation for (in the US)
  1. Federal Bureau of Investigation; an agency of the Justice Department responsible for investigating violations of Federal laws

'FBI' also found in these entries:

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