American English

Definition of sister noun from the Oxford Advanced American Dictionary



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  1. 1a girl or woman who has the same mother and father as another person She's my sister. an older/younger sister (informal) a big/little/kid sister We're sisters. Do you have any brothers or sisters? My best friend has been like a sister to me (= very close). see also half-sister, stepsister
  2. 2used for talking to or about other members of a women's organization or other women who have the same ideas, purpose, etc. as yourself They supported their sisters in the dispute.
  3. 3Sister a female member of a religious group, especially a nun Sister Mary the Sisters of Charity
  4. 4a member of a sorority (= a club for a group of female students at a college or university)
  5. 5(informal) used by black people as a form of address for a black woman
  6. 6(usually used as an adjective) a thing that belongs to the same type or group as something else our sister company in Italy a sister ship
See the Oxford Advanced Learner's Dictionary entry: sister