week / wēk/ • n. a period of seven days: the course lasts sixteen weeks he'd cut the grass a week ago. ∎ the period of seven days generally reckoned from and to midnight on Saturday night: she has an art class twice a week. ∎ workdays as opposed to the weekend; the five days from Monday to Friday: I work during the week, so I can only get to this shop on Saturdays. ∎ the time spent working in this period of five to seven days: she works a 48-hour week. ∎ a period of five or seven days devoted to a specified purpose or beginning on a specified day: Super Bowl week the week of June 23. ∎ inf., chiefly Brit. used after the name of a day to indicate that something will happen seven days after that day: the program will be broadcast on Sunday week.PHRASES: week after week during each successive week, esp. over a long period: week after week of overcast skies.week by week gradually and steadily over the weeks: Monday evening demonstrations grew week by week.a week from —— used to state that something is due to happen seven days after the specified day or date: we'll be back a week from Friday.week in, week out every week without exception.