the Federal Bureau of Investigation
noun/ðə ˌfedərəl ˌbjʊərəʊ əv ɪnˌvestɪˈɡeɪʃn/
/ðə ˌfedərəl ˌbjʊrəʊ əv ɪnˌvestɪˈɡeɪʃn/
(abbreviation FBI)
[singular]- 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
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the Federal Bureau of Investigation