Noun sister has 4 senses
- sister, sis - a female person who has the same parents as another person; "my sister married a musician"
--1 is a kind of female sibling
Antonyms: brother, blood brother
--1 has particulars: big sister; little sister; half sister, stepsister
- Sister - (Roman Catholic Church) a title given to a nun (and used as a form of address); "the Sisters taught her to love God"
--2 is a kind of nun
--2 is a member of sisterhood
- sister - a female person who is a fellow member of a sorority or labor union or other group; "none of her sisters would betray her"
--3 is a kind of member
--3 is a member of sorority
--3 has particulars: Beguine
- baby, sister - sometimes used as a term of address for attractive young women
--4 is a kind of girl, miss, missy, young lady, young woman, fille
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