1.NounA government run by and for only a few, often the aristocracy, the wealthy, or their friends and associates.
"Despite the involvement of all classes of society, America's political duopoly and the importance of money to mass-market campaigning has established an oligarchy that is seldom responsive to the citizenry as a whole, when opposed to the wealthy or major interest groups."
2.NounA state ruled by such a government.
"The 1832 Reform Act aimed to transform the British oligarchy and allow Parliament to represent the interests of a broader range of the population."
3.NounThose who make up an oligarchic government.
"The modern British oligarchy—particularly during periods of Tory rule—has been called a chumocracy."