PGRICHa ruling class or government that consists of rich people, or a country that is governed by rich people 富豪[财阀]统治阶层；由财阀组成的政府；由财阀统治的国家
Examples from the Corpus
plutocracy• Some were outright extensions of traditional hierarchies, while others were predominantly recruited from the new plutocracy and professions.
Originplutocracy
(1600-1700)Greekploutokratia, from ploutos“wealth” + -kratia“-cracy”