Definition of "oligopolist"

But through the oligopoly, charcoal fuel proliferated throughout London's trades and industries. By the 1200s, brewers and bakers, tilemakers, glassblowers, pottery producers, and a range of other craftsmen all became hour-to-hour consumers of charcoal. This only magnified the indispensable nature of the oligopolists.

2006, Edwin Black, chapter 2, in Internal Combustion‎

“As a classic oligopolist, Moody’s earns exceedingly high margins while paying only the needed lip service to product quality.”

2009 June 5, David Gillen, “In Ratings Agencies, Investors Still Trust”, in New York Times‎