This is the 2396th most frequent Chinese word.
周一
Monday
In this sentence, "周一" is used as a noun to specify the day (Monday) on which events (like meetings) occur.
我周一有很多会议。
I have many meetings on Monday.
Here, "周一" is utilized with "下" to indicate its occurrence in the subsequent week, specifying a future Monday.
下周一我们打算去旅游。
We plan to travel next Monday.
In this sentence, "周一" appears alongside "每" to express a repeated action occurring on Mondays.