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Definition sister in British English

sister noun

[countable] noun
/ˈsɪstə(r)/
1

a daughter of your parents. A son of your parents is called your brother

Example

He has two brothers and two sisters.

Example

She has to babysit for her little sister tonight.

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2

a female nurse in charge of a hospital ward (=a room for people who are ill in a hospital)

Example

the day/night sister

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2.1

used for talking to a sister in a hospital

Example

My leg is still hurting me, Sister.

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3

a nun (=a woman who is a member of a religious community)

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3.1

used in front of the first name of a nun, when talking to her or about her

Example

Sister Mary

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4

an organization or group that has close connections with another similar organization or group

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6

used by women for referring to a woman who they have strong feelings of loyalty and friendship towards

Example

support for our sisters in the armed forces

Synonyms and related words
Definition sister in British English