1 a girl or woman who has the same parents as another person 姐妹: I've got one brother and two sisters. 我有一个弟弟，两个妹妹。We're sisters. 我们是姐妹。 ☞Look at half-sister and stepsister. 参看half-sister及stepsister。 ☞In English there is no common word that means ‘both brothers and sisters ’ Have you got any brothers and sisters? The word sibling is very formal. 英语中没有兄弟和姐妹合称的常用词：Have you got any brothers and sisters?你有兄弟姐妹吗？sibling为非常正式的用语。

2 oftenSister (Brit 英) a female hospital nurse in a high position 医院的高级护士；护士长

3 Sister a member of certain female religious groups; a NUN 修女

4 (usually used as an adjective 通常用作形容词) a thing that belongs to the same type or group as sth else 同一类型或组织的事物: We have a sister company in Japan. 我们在日本有一家姐妹公司。

5 (informal 非正式) a woman who you feel close to because she is a member of the same society, group, etc as you （属同一社团、组织等关系亲密的成员）姐妹