Webster's English Dictionary

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week

week \'we-k\ n [ME weke, fr. OE wicu, wucu; akin to OHG wehha week, L]vicis 
   change, alternation, OE wi-r wire - more at WIRE 1a: one of a series of 
   seven-day cycles used in various calendars  1b1: a week beginning with a 
   specified day or containing a specified holida y {the ~ of the 18th} 
   {Easter ~} 1b2: a week appointed for public recognition of some cause {Fire 
   Preventi on Week} 2a: any seven consecutive days  2b: a series of regular 
   working, business, or school days during each seven -day period 3: a time 
   seven days before or after a specified day