/week/ , n.
1. a period of seven successive days, usually understood as beginning with Sunday and ending with Saturday.
2. a period of seven successive days that begins with or includes an indicated day: the week of June 3; Christmas week.
3. ( often cap. ) a period of seven successive days devoted to a particular celebration, honor, cause, etc.: National Book Week.
4. the working days or working portion of the seven-day period; workweek: A 35-hour week is now commonplace.
adv.
5. Brit. seven days before or after a specified day: I shall come Tuesday week. He left yesterday week.
[ bef. 900; ME weke, OE wice; c. D week, ON vika week, Goth wiko turn; akin to L vicis (gen.) turn (see VICE 3 ) ]