1a. A period of seven days: a week of rain.b.abbr.wk. A seven-day calendar period, especially one starting with Sunday and continuing through Saturday: this week.2a. A week designated by an event or holiday occurring within it: commencement week.b. A week dedicated to a particular cause or institution: Home Safety Week.3. The part of a calendar week devoted to work, school, or business: working a three-day week.4a. One week from a specified day: I'll see you Friday week.b. One week ago from a specified day: It was Friday week that we last met.
ETYMOLOGY:
Middle English weke, from Old English wicu. See weik-2 in Appendix I.
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