noun

sister

sister, nun

I have one older sister.

I have one older sister.

She became a sister at the convent.

She became a sister at the convent.

((sb.'s sister)) a female sibling She is my younger sister.

((Sister + Name)) a title for a nun Sister Mary works at the school.

Synonyms: female sibling, nun; Antonyms: brother

From Old English 'sweostor', from a Proto-Germanic root shared by many other Germanic languages.

The word has cognates in many European languages (e.g., German 'Schwester'). 'Sis' is the common affectionate diminutive.

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