1. 一周一次的;每周的
    A weekly event or publication happens or appears once a week or every week.

    e.g. Each course comprises 10-12 informal weekly meetings...
           每门课程都包括10至12次每周一次的非正式讨论会。
    e.g. We go and do the weekly shopping every Thursday.
           我们每周四去采购一次。

2. (数量或费用)按周计算的
    Weekly quantities or rates relate to a period of one week.

    e.g. In addition to my weekly wage, I got a lot of tips.
           除了每周的薪水外，我还能得到不少小费。

3. 周报;周刊
    A weekly is a newspaper or magazine that is published once a week.

    e.g. Two of the four national daily papers are to become weeklies.
           4份全国性日报中有两份将改为周报。