Week

noun
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 initial capital letter) 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.
adverb
5.
British. seven days before or after a specified day:
I shall come Tuesday week. He left yesterday week.
noun
1.
a period of seven consecutive days, esp one beginning with Sunday related adjective 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
4.
a week devoted to the celebration of a cause
adverb
5.
(mainly Brit) seven days before or after a specified day: I’ll visit you Wednesday week
weed tea

From the beginning, time was divided into weeks, each consisting of six days of working and one of rest (Gen. 2:2, 3; 7:10; 8:10, 12; 29:28). The references to this division of days becomes afterwards more frequent (Ex. 34:22; Lev. 12:5; Num. 28:26; Deut. 16:16; 2 Chr. 8:13; Jer. 5:24; Dan. 9:24-27; 10:2, 3). It has been found to exist among almost all nations.