sister - definition in the American English Dictionary - Cambridge Dictionaries Online

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sister

noun [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)
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