[doo-op-uh-lee, dyoo-]
noun, plural duopolies.
the market condition that exists when there are only two sellers. Compare monopoly ( def 1 ), oligopoly.

1915–20; duo- + (mono)poly

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World English Dictionary
duopoly (djʊˈɒpəlɪ)
n , pl -lies
a situation in which control of a commodity or service in a particular market is vested in just two producers or suppliers

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Example sentences
Because in the face of this cozy duopoly, email innovation has slowed to a crawl.
The electoral system has created a built-in political duopoly.
Better to have a vibrant multi-party system with narrower, coherent parties than the current duopoly.
For two decades they have enjoyed a duopoly in this part of the market, roughly splitting sales between them.
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