Used as a standalone noun or as a suffix to indicate a period of weeks (e.g., 一週間, 毎週).
This week was very busy.
He stayed in Japan for three weeks.
I go to the gym three times a week.
There's a meeting at the start of the week.
The latter half of the week looks like it will be busy.
every week; weekly
last week; the week before
next week
weekly publication; weekly (magazine, etc.)
weekly holiday; weekly day off
the following week; the next week
every other week; biweekly
next week
last week; the previous week
week after next
one week
weekly pay; weekly wage
weekly report; weekly bulletin
the week before last
beginning of next week; early next week
every week; weekly
the week in question; that week
last week
calendar week
once a week
by the end of this week; within the week
weekday
cycle; period