Federal is defined as?

having or relating to a system of government in which several states form a unity but remain independent in internal affairs. ( basically it just means related to the government)

Explanation:

having or relating to a system of government in which several states form a unity but remain independent in internal affairs.

"Russia's federation treaty shares powers among Russia's federal and local governments"

relating to or denoting the central government as distinguished from the separate units constituting a federation.

"the federal agency that provides legal services to the poor"

Explanation:

spread of christianity