[n] (slang) sometimes used as a term of address for attractive young women
[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"
[n] (Roman Catholic) a title given to a nun (and used as a form of address); "the Sisters taught her to love God"
[n] a female person who has the same parents as another person; "my sister married a musician"