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The Collaborative International Dictionary of English v.0.48 (gcide)

Plutocracy \Plu*toc"ra*cy\ (pl[-u]*t[o^]k"r[.a]*s[y^]), n. [Gr.
ploutokrati`a; plou^tos wealth kratei^n to be strong, to
rule, fr. krato`s strength: cf. F. plutocratie.]
A form of government in which the supreme power is lodged in
the hands of the wealthy classes; government by the rich;
also, a controlling or influential class of rich men.
[1913 Webster]