Coincident is a related term of united.
As a verb coincident
As a proper noun united is
(chiefly|british) any of many football teams formed by the amalgamation of smaller ones.
(of two events) Occurring at the same time.
(of two objects) Being in the same location.
Being in accordance, matching.
- Christianity teaches nothing but what is perfectly suitable to, and coincident with, the ruling principles of a virtuous and well-inclined man.
Joined into a single entity.
Involving the joint activity of multiple agents.