A1a 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›USold-fashionedinformalused to address a woman: [as form of address]OK, sister, move it!Friendly and unfriendly terms of address›UKa 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
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