Definitions of Federal:

• noun:   any federal law-enforcement officer
• noun:   a member of the Union Army during the American Civil War
• adjective:   of or relating to the central government of a federation

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

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

  Example: "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

  Example: "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 Civil War

  Example: "Federal forces"