週 (shū) means “week” | MotiTan Japanese Dictionary

More examples

週に一回、図書館へ行きます。shū ni ichi kai to sho kan e i ki ma su

I go to the library once a week.

その週は雨の日が多かったです。so no shū wa ame no hi ga ō ka tta de su

There were many rainy days that week.

A week presents seven consecutive days as one manageable block of time.

一週間isshūkan: A period lasting seven days from a stated starting point.

日を七つ数えた期間。hi o nana tsu kazo e ta ki kan

The Japanese word 週 (shū, "week") comes from Chinese usage of the character 週 for a recurring cycle and applies that idea to seven days.

In Japanese calendars, 週 (shū) is a useful unit for viewing recurring appointments, lessons, and club activities across a month.