What is the meaning of Federation?

Act of joining together into a single political entity.

Array of nations or states that are unified under one central authority which is elected by its members.

Any society or organisation formed from separate groups or bodies.

A collection of network or telecommunication providers that offer interoperability.

Of an architectural style popular around the time of federation.

unofficial form of føderation

federation; an array of states or nations

Source: wiktionary.org