If two companies or people have a duopolyon something such as an industry, they share complete control over it and it is impossible for others to become involved in it.
[business]
They are no longer part of a duopoly on overseas routes.
2. countable noun
A duopoly is a group of two companies which are the only ones which provide a particular product or service, and which therefore have complete control over an industry.
[business]
Their smaller rival is battling to end their duopoly.
duopoly in British English
(djʊˈɒpəlɪ)
nounWord forms: plural-lies
a situation in which control of a commodity or service in a particular market is vested in just two producers or suppliers
Derived forms
duopolistic (ˌdjʊɒpəˈlɪstɪk)
adjective
duopoly in American English
(duˈɑpəli; djuˈɑpəli)
noun
control of a commodity or service in a given market by only two producers or suppliers