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Definition of fbi
fbi
/ˌɛf.biːˈaɪ/
F · B · I
fbi Lexical Profile
CEFR
B1
Grade
5
Tier
1
Usage
Top 5k
• noun
1
American The Federal Bureau of Investigation; the principal federal investigative agency and domestic intelligence service of the United States, operating under the Department of Justice.
Example
"Local authorities requested assistance from the FBI to investigate the interstate cybercrime ring."
Synonyms
View all synonyms for fbi• Rhymes for fbi
Word Origin & Etymology
An initialism of Federal Bureau of Investigation, the agency's official name adopted in 1935 after having been founded in 1908 as the Bureau of Investigation.
Cite this Entry
Wordmom. (2026). Definition of Fbi. In Wordmom Dictionary. Retrieved Oct 30, 2026, from https://wordmom.com/dictionary/fbi