1. (寄宿学校等的)大寝室，集体寝室
    A dormitory is a large bedroom where several people sleep, for example in a boarding school.

dormitory的近义词

    e.g. ...the boys' dormitory...
           男生寝室
    e.g. The latest refugees were housed in makeshift dormitories.
           新来的难民被安置在临时的集体寝室里。

2. (大学等的)学生宿舍
    A dormitory is a building in a college or university where students live.

    e.g. She lived in a college dormitory.
           她住在大学宿舍里。

3. (在大城市工作者居住的)邻镇住宅区的，郊外住宅区的
    If you refer to a place as a dormitory suburb or town, you mean that most of the people who live there travel to work in another, larger town a short distance away.

    e.g. It had become almost a dormitory suburb of the city.
           它几乎成为了城市的一个市郊住宅区。