Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “sister”

See all translations

sister

noun [C] uk   /ˈsɪs.tər/ us    /-tɚ/
A1 a girl or woman who has the same parents as another person: Sophie and Emily are sisters. Emily is Sophie's younger/little/older/big sister. a girl or woman who treats you in the kind way that a sister would: Lynn's such a good friend - she's like a sister to me. a woman who shares an interest with you, especially that of improving women's rights: [as form of address] "We must continue the fight, sisters!" US old-fashioned informal used to address a woman: [as form of address] OK, sister, move it! UK a female nurse who is in charge of a department of a hospital: The sister told us that visiting hours were over. [as form of address] Excuse me, Sister, could I have some water?
Compare
a female member of a religious group, especially a nun: Sister Bernadette [as form of address] God bless you, Sister.
More examples

sister

adjective [before noun] uk   /ˈsɪs.tər/ us    /-tɚ/
belonging to a pair or group of similar and related things, such as businesses, usually owned or operated by the same person or organization: our sister company in Australia the US battleship Missouri and her sister ship, the Wisconsin
(Definition of sister from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of sister?
Add Cambridge dictionaries to your browser to your website

Definitions of “sister” in other dictionaries

Word of the Day

derivative

If something is derivative, it is not the result of new ideas, but has been developed from or copies something else.

Word of the Day

Lies, lies, lies!

by Kate Woodford,
February 25, 2015
​​​ According to sociologists (=people who study the relationships between people living in groups), we are good at lying. As a species, we have developed a remarkable ability to deceive each other (= persuade each other that something false is true). Being able to say things that are not true can help with

Read More 

snapchat verb

March 02, 2015
to send someone a message using the photomessaging application Snapchat We used to have a thing until he got a girlfriend. now

Read More