Week
Week , noun
[Old English weke, wike, woke, wuke Anglo-Saxon weocu, wicu, wucu; akin to Old Saxon wika, OFries. wike, Dutch week, German woche, Old High German wohha, wehha, Icelandic vika, Swedish vecka, Danish uge, Gothic wik{not transcribed}, probably originally meaning, a succession or change, and akin to German wechsel change, Latin vicis turn, alternation, and English weak. Compare Weak.]
A period of seven days, usually that reckoned from one Sabbath or Sunday to the next.
I fast twice in the week.
Although it [the week] did not enter into the calendar of the Greeks, and was not introduced at Rome till after the reign of Theodesius, it has been employed from time immemorial in almost all Eastern countries. Encyc. Brit.