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Definitions of sister
  1. noun
    a female person who has the same parents as another person
    "my sister married a musician"

    Similar: 

    sis
    Opposite:
    type of:
  2. noun
    a female person who is a fellow member of a sorority or labor union or other group
    "none of her sisters would betray her"
  3. noun
    (Roman Catholic Church) a title given to a nun (and used as a form of address)
    type of:
    nun
Antonyms of sister
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