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English definition of “sister”

sister

noun [C]     /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.Family relations in general 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.Family relations in general 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!"Kinds of womenMen and women US old-fashioned informal used to address a woman: [as form of address] OK, sister, move it!Friendly and unfriendly terms of address UK a nurse who is in charge of a department of a hospital: The sister told us that visiting hours were over. [as form of address] Excuse me, Sister, could I have some water?Doctors and health workers generally a female member of a religious group, especially a nun: Sister Bernadette [as form of address] God bless you, Sister.Monks and nuns
(Definition of sister noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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