1. (议会等的)会议;(法庭的)开庭
    A session is a meeting of a court, parliament, or other official group.

    e.g. ...an emergency session of parliament...
           议会紧急会议
    e.g. After two late night sessions, the Security Council has failed to reach agreement...
           在深夜召开两次会议后，安全理事会还是没有达成一致。

2. (议会等的)会期;(法庭的)开庭期
    A session is a period during which the meetings of a court, parliament, or other official group are regularly held.

    e.g. The parliamentary session ends on October 4th...
           议会会期在10月4日结束。
    e.g. From September until December, Congress remained in session.
           从 9 月到 12 月，国会一直都在开会。

3. (某项活动的)一段时间，一场，一节
    A session of a particular activity is a period of that activity.

session的反义词

    e.g. The two leaders emerged for a photo session.
           两位领导现身接受记者拍照。
    e.g. ...group therapy sessions.
           小组治疗时间

4. (音乐家)伴奏的
    Session musicians are employed to play backing music in recording studios.

    e.g. He established himself as a session musician.
           他成为了一位伴奏音乐家。
    e.g. ...a session drummer.
           伴奏鼓手