- a period of seven successive days, usually understood as beginning with Sunday and ending with Saturday.
- a period of seven successive days that begins with or includes an indicated day: the week of June 3; Christmas week.
- (often initial capital letter) a period of seven successive days devoted to a particular celebration, honor, cause, etc.: National Book Week.
- the working days or working portion of the seven-day period; workweek: A 35-hour week is now commonplace.