federate

Short definition from Wiktionary

Adjective

1. 1
   Federated, united in an alliance or federation.

Noun

1. 1
   A member of a federation.
2. 2
   Anglicised form of Latin foederatus.
3. 3
   a system participating in a collective simulation, particularly within the context of the HLA (High Level Architecture) standard.

Verb

1. 1
   To unite in a federation.