Noun
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(slang) sometimes used as a term of address for attractive young women
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a female person who is a fellow member of a sorority or labor union or other group
"none of her sisters would betray her"
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(Roman Catholic Church) a title given to a nun (and used as a form of address)
"the Sisters taught her to love God"
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a female person who has the same parents as another person
"my sister married a musician"