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Learner's definition of WEEK. 1. : a period of seven days. â In the U.S., a week is usually considered to start on Sunday and end on Saturday, while in the U.K. a week is usually considered to start on Monday and end on Sunday.
From Wikipedia, the free encyclopedia. Biweekly may refer to an event that occurs either twice weekly or once every two weeks. There are 52 full weeks in a year of 12 months (ISO 8601 defines a year as containing 52 or 53 weeks), making for a possible 26 or 104 biweekly events in a year.rom Wikipedia, the free encyclopedia. Biweekly may refer to an event that occurs either twice weekly or once every two weeks. There are 52 full weeks in a year of 12 months (ISO 8601 defines a year as containing 52 or 53 weeks), making for a possible 26 or 104 biweekly events in a year.