Confederate (possibly acting-related, not CSA-related) 是什麼意思

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"In addition to the participants, two other key participants were part of the study: a **confederate** (a 47-year-old accountant) posing as another participant and an actor (dressed in a gray lab coat, looking very official) playing the part of the experimenter."

"This drawing was rigged so that the true participant always became the teacher and the accomplice was always the learner. Keep in mind that the 'learner' was a **confederate** in the experiment, as was the person playing the part of the experimenter."