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English definition of “third party”

third party

noun [C]  /ˈθɜrd ˈpɑr·ti/ us  

third party noun [C] (POLITICAL GROUP)

social studies any political party (= organization to get people elected) that is not as big or as influential as the two main parties

third party noun [C] (PERSON)

a person who is not one of the two main people involved in an argument or legal case
(Definition of third party from the Cambridge Academic Content Dictionary © Cambridge University Press)
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