sister

noun

1. 1

   (slang) sometimes used as a term of address for attractive young women

   the Sisters taught her to love God

2. 2

   (Roman Catholic Church) a title given to a nun (and used as a form of address)

   the Sisters taught her to love God

3. 3

   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. 4

   a female person who has the same parents as another person

   my sister married a musician