Definition of week
1 a
: 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
2 a
: 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
