federate
This term describes the process of merging autonomous entities into a structured union where power is shared between a central authority and the constituent members. It carries a formal, political, or organizational tone, suggesting a strategic alliance rather than a total absorption or merger. As a noun, the word refers to the individual member state or organization. While it is a countable noun, it is used far less frequently in this form than the verb, often appearing in legal or historical texts regarding treaties and alliances.
Meanings
To join separate states, organizations, or groups together into a single federal union or alliance.
"The small provinces decided to federate to increase their collective bargaining power."
To form a federation or a league of autonomous entities.
"The various regional guilds began to federate in the late nineteenth century."