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

"The Sisters taught her to love God"

Category: People

2.Definition: a female person who has the same parents as another person

"My sister married a musician"

Related Noun(s):sis

Category: People

3.Definition: a female person who is a fellow member of a sorority or labor union or other group

"None of her sisters would betray her"

Category: People