sister ( sisters plural )
1 n-count Your sister is a girl or woman who has the same parents as you.
oft poss N
His sister Sarah helped him., ...Vanessa Bell, the sister of Virginia Woolf..., I didn't know you had a sister.
2 n-count; n-title; n-voc Sister is a title given to a woman who belongs to a religious community.
Sister Francesca entered the chapel., ...the Hospice of the Sisters of Charity at Lourdes.
3 n-count; n-title; n-voc A sister is a senior female nurse who supervises part of a hospital.
Ask to speak to the sister on the ward..., Sister Middleton followed the coffee trolley.
4 n-count You can describe a woman as your sister if you feel a connection with her, for example because she belongs to the same race, religion, country, or profession.
usu poss N
Modern woman has been freed from many of the duties that befell her sisters in times past.
5 adj You can use sister to describe something that is of the same type or is connected in some way to another thing you have mentioned. For example, if a company has a sister company, they are connected. ADJ n ...the International Monetary Fund and its sister organisation, the World Bank.
half-sister ( half-sisters plural ) Someone's half-sister is a girl or woman who has either the same mother or the same father as they have. n-count oft poss N
sister-in-law ( sisters-in-law plural ) Someone's sister-in-law is the sister of their husband or wife, or the woman who is married to their brother. n-count oft poss N
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