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Dictionary definition for: Sister
1. (n) a female person who has the same parents as another person; "my sister married a musician"
2. (n) (Roman Catholic Church) a title given to a nun (and used as a form of address) "the Sisters taught her to love God"
3. (n) a female person who is a fellow member of a sorority or labor union or other group; "none of her sisters would betray her"
4. (n) sometimes used as a term of address for attractive young women
WordNet 2.1 Copyright Princeton University. All rights reserved.