Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “sister”

sister

noun [C]    /ˈsɪs·tər/
a female who has the same parents as another person: an older/younger sister A sister is also a woman who is a member of the same race, church, religious group, or organization as others: a sorority sister Sister may be used as a form of address to a woman.
(Definition of sister noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of sister

More American English definitions for “sister”

Definitions of “sister” in other dictionaries

Word of the Day

touch

an ability to do things in the stated, especially positive, way

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More