[] ( oligopolies) () the control of trade in particular goods or the supply of a particular service by a small group of companies; the type of goods or service that is controlled in this way; the companies that control the trade寡头卖主垄断；寡头垄断企业（或产品）◆The North American market will ultimately turn into an oligopoly of five or six companies.北美市场最终会形成由五、六家公司组成的寡头垄断。ⓘ Oligopoly is formed from the words oligarchy and monopoly.oligopoly 一词由 oligarchy 和 monopoly 构成。