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English definition of “posse”

posse

noun [C, + sing/pl verb] uk   /ˈpɒs.i/ us    /ˈpɑː.si/
a group of people who have come together for the same purpose: The disgraced minister walked swiftly from the car to his house pursued by a whole posse of reporters.Groups of people in the past, a group of men in the US who were brought together to catch a criminal: The sheriff rounded up a posse and went after the bank robbers.Relating to detection and solving crimes slang a group of friends: I was hanging with my posse.Friends, acquaintances and contemporaries
(Definition of posse from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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