The Collaborative International Dictionary of English v.0.48:

Week-end \Week"-end"\, n.
   The end of the week, usually comprising the period from
   Friday evening to Monday morning, observed commonly as a
   period of respite from work or school; as, to visit one for a
   week-end; also, a house party during a week-end. Contrasted
   to work days.

   Note: Where work days continue throught Saturday morning, the
         weekend starts on Saturday at noon.
         [Webster 1913 Suppl. +PJC]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "weekend":
   Christmas, Sunday, buy time, consume time, furlough,
   go on furlough, go on leave, holiday, keep time, kill time, leave,
   leave of absence, liberty, look for time, make holiday,
   measure time, occupy time, paid holiday, paid vacation, pass time,
   put in time, race against time, sabbatical, sabbatical leave,
   sabbatical year, shore leave, spend time, summer, take a holiday,
   take leave, take time, take up time, time off, use time, vacation,
   winter, work against time