sister

Universal Words noun 1 a girl or woman who has the same mother and father as another person: She's my sister. * an older / younger sister * (informal) a big / little / kid sister * We're sisters. * Do you have any brothers or sisters? * My best friend has been like a sister to me (= very close). seealsoHALF-SISTER, STEPSISTER 2 used for talking to or about other members of a women's organization or other women who have the same ideas, purpose, etc. as yourself: They supported their sisters in the dispute. 3 (Sister) (BrE) a senior female nurse who is in charge of a hospital WARD seealsoCHARGENURSE 4 (Sister) a female member of a religious group, especially a NUN: Sister Mary * the Sisters of Charity 5 (in the US) a member of a SORORITY (= a club for a group of female students at a college or university) 6 (AmE, informal) used by black people as a form of address for a black woman 7 (usually used as an adjective) a thing that belongs to the same type or group as sth else: our sister company in Italy * a sister ship