duopolynoun [ C, usually singular ]
uk/djuˈɒpəli/us/duˈɒpəli/plural duopolies ECONOMICSa situation in which only two companies control all the business in a particular industry:
The merger would clearly create a duopoly in the industry.
the two companies that control all the business in a particular industry:
It was their magazine that was hardest hit by the duopoly's falling out.