A daughter of the same parents as another person; a female sibling.
My sister is always driving me crazy.
A female member of a religious order; especially one devoted to more active service; (informally) a nun.
Michelle left behind her bank job and became a sister at the local convent.
Any butterfly in the genus Adelpha, so named for the resemblance of the dark-colored wings to the black habit traditionally worn by nuns.
A senior or supervisory nurse, often in a hospital.
Any woman or girl with whom a bond is felt through common membership of a race, profession, religion or organization, such as feminism.
Connie was very close to her friend Judy and considered her to be her sister.
(sometimes capitalized) A black woman.
A form of address to a woman.
What’s up, sister?
A woman, in certain labour or socialist circles; also as a form of address.
Thank you, sister. I would like to thank the sister who just spoke.
An entity that has a special or affectionate, non-hierarchical relationship with another.
sister city
A node in a data structure that shares its parent with another node.
(usually attributively) Something in the same class.
sister facility
To strengthen (a supporting beam) by fastening a second beam alongside it.
I’m trying to correct my sagging floor by sistering the joists.
To be sister to; to resemble closely.