Definition of week
1a
: any of a series of 7-day cycles used in various calendars
especially
: a 7-day cycle beginning on Sunday and ending on Saturday
b(1)
: a week beginning with a specified day or containing a specified holiday
the week of the 18th
(2)
: a week appointed for public recognition of some cause
2a
: any seven consecutive days
b
: a series of regular working, business, or school days during each 7-day period
3
British
: a time seven days before or after a specified day
last Sunday week
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Merriam-Webster unabridged
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Time Traveler for week
The first known use of week was before the 12th century
See more words from the same century