week

UK: /ˈwiːk/ US: /wik/ ,(wēk)

WordReference Random House Learner's Dictionary of American English © 2025

week /wik/   n. [countable]

1. a period of seven days following one after the other, usually beginning with Sunday.
2. the working portion of a week, usually not including Saturday and Sunday:
   a 35-hour week.

WordReference Random House Unabridged Dictionary of American English © 2025

week  (wēk), 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. British Terms seven days before or after a specified day:
   I shall come Tuesday week. He left yesterday week.

• bef. 900; Middle English weke, Old English wice; cognate with Dutch week, Old Norse vika week, Gothic wikō turn; akin to Latin vicis (genitive) turn (see vice³)

Collins Concise English Dictionary © HarperCollins Publishers::

week / wiːk/ noun

1. a period of seven consecutive days, esp (following Judaeo-Christian tradition) one beginning with a Sunday or (following ISO convention) one beginning with a Monday
   Related adjective(s): hebdomadal
2. a period of seven consecutive days beginning from or including a specified day: Easter week, a week from Wednesday
3. the period of time within a week devoted to work

adverb

1. seven days before or after a specified day: I'll visit you Wednesday week

Etymology: Old English wice, wicu, wucu; related to Old Norse vika, Gothic wikō order