Definition of sister noun from the Oxford Advanced Learner's Dictionary

      

    sister

     noun
    noun
    BrE BrE//ˈsɪstə(r)//
     
    ; NAmE NAmE//ˈsɪstər//
     
    Hospitals, Religious people, Relations
     
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  1. 1   a 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 See related entries: Relations
  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. 3 Sister (British English) a senior female nurse who is in charge of a hospital ward see also charge nurse See related entries: Hospitals
  4. 4 Sister a female member of a religious group, especially a nun Sister Mary the Sisters of Charity See related entries: Religious people
  5. 5(in the US) a member of a sorority (= a club for a group of female students at a college or university)
  6. 6(North American English, informal) used by black people as a form of address for a black woman
  7. 7(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
  8. Word Origin Old English, of Germanic origin; related to Dutch zuster and German Schwester, from an Indo-European root shared by Latin soror.Extra examples Carolyn’s sorority sisters at Indiana University Have you got any brothers and sisters? I have no brothers or sisters. The girls are so close, they’re like sisters. a refugee who traced his long-lost sister my bratty little sister
See the Oxford Advanced American Dictionary entry: sister