总结会？
这个帖子：
answers.yahoo.com/question/in…
一位网友给出了最佳答案：
It is a specific day (but not date) set for a meeting, event, performance, etc. It is expressed by ‘Every first Monday’, ‘Second and fourth Thursdays of every month’, ‘First Tuesday of each calendar quarter’, or similar phrasing specifying the day of the week and the week something will regularly occur.
一周，一个月或者一年中特定时间内开展的会议，比如一周的第一天，一个月的某一天，等等。日期不定，但是这一天在某周或者某月的相对顺序是确定不变的。来自法语。
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