Pronunciation (UK) IPA (key): /djuːˈɒpəli/ or /duː-/ (US) IPA (key): /duˈɑpəli/ Audio (US)(file) Hyphenation: du‧o‧po‧ly Noun Singular duopoly Plural duopolies (economics) A duopoly is a condition in which two sellers have most of the control over the market. Related words monopoly Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads