[1] : 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
see also:
weak feast of weeks pentecost prophetic week week day day 

[2] : WordNet (r) 2.0

week
     n 1: any period of seven consecutive days; "it rained for a week"
          syn: hebdomad
     2: a period of seven consecutive days starting on sunday syn:
        calendar week
     3: hours or days of work in a calendar week; "they worked a
        40-hour week" syn: workweek
see also:
hebdomad calendar week workweek 

[3] : Moby Thesaurus II by Grady Ward, 1.0

57 moby thesaurus words for "week":
   heptateuch, abundant year, academic year, annum, bissextile year,
   calendar month, calendar year, century, common year, day, decade,
   decennary, decennium, defective year, fiscal year, fortnight,
   heptachord, heptad, heptagon, heptahedron, heptameter, heptarchy,
   heptastich, hour, leap year, lunar month, lunar year, lunation,
   luster, lustrum, man-hour, microsecond, millennium, millisecond,
   minute, moment, month, moon, quarter, quinquennium, regular year,
   second, semester, septennate, septet, septuor, session, seven,
   sevener, sidereal year, solar year, sun, term, trimester,
   twelvemonth, weekday, year

[4] : Easton's 1897 Bible Dictionary

week
   from the beginning, time was divided into weeks, each consisting
   of six days of working and one of rest gen. 2:2, 3; 7:10; 8:10,
   12; 29:28. the references to this division of days becomes
   afterwards more frequent ex. 34:22; lev. 12:5; num. 28:26;
   deut. 16:16; 2 chr. 8:13; jer. 5:24; dan. 9:24-27; 10:2, 3. it
   has been found to exist among almost all nations.
   

[5] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

week. seven days of time. 
     2. the week commences immediately after twelve o'clock, on the night 
between saturday and sunday, and ends at twelve o'clock, seven days of 
twenty-four hours each thereafter. 
     3. the first day of the week is called sunday; q.v. the second, 
monday; the third, tuesday; the, fourth, wednesday; the fifth, thursday; the 
sixth, friday; and the seventh, saturday. vide 4 pet. s. c. rep. 361. 

Week >> W Words
Week, definition of term: Week
week_pag1.html

Week Day >> W Words
Week Day, definition of term: Week Day
week+day_pag1.html

Calendar Week >> C Words
Calendar Week, definition of term: Calendar Week
calendar+week_pag1.html