fbi What is the Definition of fbi?Noun:a federal law enforcement agency that is the principal investigative arm of the Department of Justice Other meanings of fbi (synonyms, cognates). ENRU fbi фбр Frequently viewed: friendly meaningfull definitiondefinition of sameyoung definitiondefinition of visibilitystale definitiondefinition of surfacedefinition of bottleneckprefix definitionvirtually definitiondefinition of wrongbrute definition A B C D E F G H I J K L M N O P Q R S T U V W X Y Z