sister Meaning in the Cambridge English Dictionary
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Meaning of “sister” in the English Dictionary

"sister" in British English

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sisternoun [C]

uk   /ˈsɪs.tər/  us   /-tɚ/
A1 a ​girl or woman who has the same ​parents as another ​person: Sophie and Emily are sisters. Emily is Sophie's ​younger/little/​older/​big sister. a ​girl or woman who ​treats you in the ​kind way that a sister would: Lynn's such a good ​friend - she's like a sister to me. a woman who ​shares an ​interest with you, ​especially that of ​improving women's ​rights: [as form of address] "We must ​continue the ​fight, sisters!" US old-fashioned informal used to ​address a woman: [as form of address] OK, sister, ​move it! a ​femalemember of a ​religiousgroup, ​especially a nun: Sister Bernadette [as form of address] Godbless you, Sister. UK a ​femalenurse who is in ​charge of a ​department of a ​hospital: The sister told us that ​visitinghours were over. [as form of address] Excuse me, Sister, could I have some ​water?
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sisteradjective [before noun]

uk   /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 Wisconsin
(Definition of sister from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sister" in American English

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sisternoun [C]

 us   /ˈsɪs·tər/
a ​female who has the same ​parents as another ​person: an ​older/​younger sister A sister is also a woman who is a ​member of the same ​race, ​church, ​religiousgroup, or ​organization as ​others: a ​sorority sister Sister may be used as a ​form of ​address to a woman.
(Definition of sister from the Cambridge Academic Content Dictionary © Cambridge University Press)

"sister" in Business English

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sisteradjective [before noun]

uk   us   /ˈsɪstər/
used to describe one of the ​organizations or ​companies in a ​pair or ​group of similar ​organizations when referring to it in relation to the others: The ​competition is being ​run in conjunction with our sister ​publication Money Observer. sister ​company/​organization
(Definition of sister from the Cambridge Business English Dictionary © Cambridge University Press)
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