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Definition of the Federal Bureau of Investigation noun from the Oxford Advanced Learner's Dictionary

the Federal Bureau of Investigation

noun
 
/ðə ˌfedərəl ˌbjʊərəʊ əv ɪnˌvestɪˈɡeɪʃn/
 
/ðə ˌfedərəl ˌbjʊrəʊ əv ɪnˌvestɪˈɡeɪʃn/
(abbreviation FBI)
[singular]
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  1. the police department in the US that is controlled by the national government and that is responsible for dealing with crimes that affect more than one state
See the Federal Bureau of Investigation in the Oxford Advanced American Dictionary
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