Definition of "Federal" :

noun: any federal law-enforcement officer

noun: a member of the Union Army during the American Civil War

adjective: national; especially in reference to the government of the United States as distinct from that of its member units

"The Federal Bureau of Investigation."

adjective: characterized by or constituting a form of government in which power is divided between one central and several regional authorities

"A federal system like that of the United States."

adjective: being of or having to do with the northern United States and those loyal to the Union during the American Civil War

"Federal forces."

adjective: of or relating to the central government of a federation

"A federal district is one set aside as the seat of the national government."