Meaning of “sister” in the English Dictionary

"sister" in British English

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sisternoun [ C ]

uk /ˈsɪs.tər/ us /ˈsɪs.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:

a female member of a religious group, especially a nun:

Sister Bernadette

UK a female 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?

More examples

  • While I struggled, my sister coasted through school with top grades.
  • You're confusing me with my sister, - she's the one studying drama.
  • I do like her - after all, she is my sister.
  • Not content with having upset my parents, he then insulted my sister!
  • I've got a family crisis on my hands - my 16-year-old sister is pregnant.

sisteradjective [ before noun ]

uk /ˈsɪs.tər/ us /ˈsɪs.tɚ/

(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, religious group, 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 /ˈsɪstər/ us

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.

(Definition of “sister” from the Cambridge Business English Dictionary © Cambridge University Press)