A week is a period of seven days. Some people consider that a week starts on Monday and ends on Sunday.

A week is a period of about seven days.

Your working week is the hours that you spend at work during a week.

The week is the part of the week that does not include Saturday and Sunday.

You use week in expressions such as 'a week on Monday', 'a week next Tuesday', and 'tomorrow week' to mean exactly one week after the day that you mention.

You use week in expressions such as 'a week last Monday', 'a week ago this Tuesday', and 'a week ago yesterday' to mean exactly one week before the day that you mention.

If you say that something happens week in week out, you do not like it because it happens all the time, and never seems to change.