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: money definitionalone meaningpolicy definitionlatter meaningalready definitiondoor in a sentencedefinition of worldmade meaningdynamic definitionseen meaninginteger meaningmemory in a sentence 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