A member of a confederacy.
An accomplice in a plot.
An actor who participates in a psychological experiment pretending to be a subject but in actuality working for the researcher.
of, relating to, or united in a confederacy
banded together; allied.
To combine in a confederacy.
separated or split into pieces
disunited
having conflicting opinions, interests or emotions
(of a road) separated into lanes, that move in opposite directions, by a median