/ djuːˈɒpəli; NAmE duːˈɑː-/ noun ( pl. -ies ) ( business )
1.
a right to trade in a particular product or service, held by only two companies or organizations
2.
a group of two companies or organizations who hold a duopoly
—compare monopoly
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WORD ORIGIN
1920s: from duo- , on the pattern of monopoly .