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Definition of sister

sister

/ˈsɪs.tɚ/
sis · ter

Plural:sisters
•
Adjective:sisterly
•
Past Simple:sistered
•
Past Participle:sistered
•
Present Participle:sistering
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sister Lexical Profile

sister Game Scores & Validity

• noun

1

A woman or girl in relation to other daughters and sons of her parents; a female sibling.

Example

"My older sister is studying architecture at the state university."


2

A female fellow member of a group, association, labor union, or shared identity, or a close female friend.

Example

"She stood in solidarity with her union sisters during the contract negotiations."


3

A female member of a religious order, especially a Roman Catholic nun; also used as a title of address.

Example

"The sisters at the local convent operate a community food pantry and clinic."


4

British A senior female nurse, typically one in charge of a hospital ward or clinic.

Example

"The ward sister reviewed the patient charts before the morning medical rounds."

Synonyms
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Antonyms
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• adjective

1

Related, allied, or paired by shared origins, characteristics, or affiliation (used only before a noun, as in sister company or sister city).

Example

"Our municipality recently signed a cultural exchange agreement with its sister city in Japan."

Synonyms
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Antonyms
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• verb

1

To strengthen or reinforce a structural beam or joist by fastening a second piece of timber or metal alongside it (in carpentry and construction).

Example

"The contractor had to sister the sagging floor joists before laying the new hardwood."


2

To act as a sister toward someone, or to pair with another entity as a sister organization or city.

Example

"Our town voted to sister with a coastal village in Portugal to promote educational exchanges."

Synonyms
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Antonyms
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• Rhymes for sister

Word Origin & Etymology

Derived from Old English sweostor and reinforced by Old Norse systir, both tracing back to the Proto-Germanic *swester and the Proto-Indo-European root *swésōr, meaning 'woman of one's own kin group.'

Cite this Entry


Wordmom. (2026). Definition of Sister. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/sister
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