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From The Collaborative International Dictionary of English v.0.48:
Week \Week\, n. [OE. weke, wike, woke, wuke AS. weocu, wicu, wucu; akin to OS. wika, OFries. wike, D. week, G. woche, OHG. wohha, wehha, Icel. vika, Sw. vecka, Dan. uge, Goth. wik?, probably originally meaning, a succession or change, and akin to G. wechsel change, L. vicis turn, alternation, and E. weak. Cf. Weak.] A period of seven days, usually that reckoned from one Sabbath or Sunday to the next. [1913 Webster] I fast twice in the week. --Luke xviii. 12. [1913 Webster] Note: 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. [1913 Webster] Feast of Weeks. See Pentecost, 1. Prophetic week, a week of years, or seven years. --Dan. ix. 24. Week day. See under Day. [1913 Webster]