1. 专题讨论会;研讨会
    A seminar is a meeting where a group of people discuss a problem or topic.

seminar

    e.g. ...a series of half-day seminars to help businessmen get the best value from investing in information technology.
           旨在帮助商界人士从投资信息技术中获得最大价值的一系列半日研讨会

2. (大学里由教师指导一小组学生参加的)研讨班，研讨课
    A seminar is a class at a college or university in which the teacher and a small group of students discuss a topic.

seminar的翻译

    e.g. Students are asked to prepare material in advance of each weekly seminar.
           学生要在上每星期的研讨课前备好材料。