1. 出席;参加;出勤
    Someone's attendance at an event or an institution is the fact that they are present at the event or go regularly to the institution.

    e.g. Her attendance at school was sporadic.
           她三天两头旷课。

2. 出席的人数
    The attendance at an event is the number of people who are present at it.

    e.g. Average weekly cinema attendance in February was 2.41 million...
           2月份，平均每周的观影人数为241万。
    e.g. This year attendances were 28% lower than forecast...
           今年的出席人数比预期少28%。

3. 到（某地）；出席（某活动）
    If someone is in attendance at a place or an event, they are there.

    e.g. Councillor Paul Tisley will be in attendance at the start of the meeting to welcome us...
           议员保罗·提斯里将在会议开始时出席，以欢迎我们。
    e.g. Police with riot gear and several fire engines are in attendance.
           防暴警察和数辆消防车都到了。

4. 陪同；陪伴
    If someone is in attendance on an important person, they are accompanying that person as a servant or assistant.

    e.g. He lived in considerable style, travelling widely, usually with a cook, valet, butler and chauffeur in attendance.
           他活得相当潇洒，通常带着厨师、用人、管家和司机到处游玩。