1. sister

noun. (ˈsɪstɝ) A female person who has the same parents as another person.
Synonyms
big sister stepsister female sibling little sister sis half-sister half sister
Antonyms
brother male sibling succeed stay in place attend
Etymology
sister (English)
sister (Middle English (1100-1500))

2. foster-sister

noun. Your foster sister is a female who is not a daughter of your parents but who is raised by your parents.
Synonyms
foster sister female female person
Antonyms
male man male child boy

3. half-sister

noun. A sister who has only one parent in common with you.
Synonyms
stepsister sis sister half sister
Antonyms
brother male sibling nonmember half-brother big brother
Etymology
half-sister (English)
half-suster (Middle English (1100-1500))

4. sister-in-law

noun. (ˈsɪstɝɪnˌlɔ) The sister of your spouse.
Synonyms
relative-in-law in-law

5. sister

noun. (ˈsɪstɝ) (slang) sometimes used as a term of address for attractive young women.
Synonyms
babe girl baby young lady young woman fille missy miss
Antonyms
parent man male male child boy
Etymology
sister (English)
sister (Middle English (1100-1500))

6. sister

noun. (ˈsɪstɝ) A female person who is a fellow member of a sorority or labor union or other group.
Synonyms
fellow member sorority member Beguine
Antonyms
nonmember son male offspring attend to mind
Etymology
sister (English)
sister (Middle English (1100-1500))

7. Sister

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