Noun

(wikipedia week) (en noun)

Any period of seven consecutive days.

* {{quote-magazine, date=2013-07-06, volume=408, issue=8843, page=68, magazine=(The Economist)

, title=[http://www.economist.com/news/finance-and-economics/21580518-terrible-name-interesting-trend-rise-smart-beta The rise of smart beta] , passage=Investors face a quandary. Cash offers a return of virtually zero in many developed countries; government-bond yields may have risen in recent weeks but they are still unattractive. Equities have suffered two big bear markets since 2000 and are wobbling again. It is hardly surprising that pension funds, insurers and endowments are searching for new sources of return.}}

A period of seven days beginning with Sunday or Monday.

A subdivision of the month into longer periods of work days punctuated by shorter weekend periods of days for markets, rest, or religious observation such as a sabbath.(rfex)

Seven days after ((sometimes) before) a specified date.