SISTER

[noun] [C] - a female who has the same parents as another personSophie and Emily are sisters.Emily is Sophie's younger/little/older/big sister.Lyn's such a good friend - she's like a sister to me (= she treats me in the kind way that a sister would).We must continue the fight, sisters (= women who share a common interest, esp. that in improving women's rights). [as form of address](US informal dated) Sister is sometimes used to address a woman.OK, sister, move it!(UK and ANZ) A sister is also a nurse who is in charge of a department of a hospital.There are two sisters on duty tonight.(UK and ANZ) Sister Jones was very kind to my mother when she was in hospital. [as form of address]A sister is also a female member of a religious group, esp. a nun.The sisters are spending an hour in private prayer.Sister Catherine is leading the prayers this morning. [as form of address]Our sister company (= a company with the same owner) in Australia has had a very successful year this year.The US battleship Missouri has been joined by her sister ship, Wisconsin.(UK) John is a true sister under the skin (= a man who supports women's action to improve their rights).