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English definition of “sister”

sister

adjective [before noun]     /ˈsɪs.tər/ US  /-tɚ/
belonging to a pair or group of similar and related things, such as businesses, usually owned or operated by the same person or organization: our sister company in Australia the US battleship Missouri and her sister ship, the WisconsinSocieties, clubs and organizations
(Definition of sister adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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