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oligarch (n.)

"one of a few holding political power, member of an oligarchy," c. 1600, from French olygarche, oligarque, from Latinized form of Greek oligarkhēs, which is related to oligarkhia "government by the few" (see oligarchy).

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Definitions of oligarch from WordNet

oligarch (n.)
one of the rulers in an oligarchy;
From wordnet.princeton.edu