federation

1. An act of joining together into a single political entity. (countable, uncountable) · It is 106 years since federation.
2. An array of nations or states that are unified under one central authority. (countable, uncountable)
3. Any society or organisation formed from separate groups or bodies. (countable, uncountable)
4. A collection of network or telecommunication providers that offer interoperability. (countable, uncountable)

Plural federations