adj., n., & v.
adj. esp. Polit. allied; joined by an agreement or treaty.
n. 1 an ally, esp. (in a bad sense) an accomplice. 2 (Confederate) a supporter of the Confederate States.
v. (often foll. by with) 1 tr. bring (a person, State, or oneself) into alliance. 2 intr. come into alliance. Confederate States States which seceded from the US in 1860-1.
[ LL confoederatus (as com-, federate) ]