The Collaborative International Dictionary of English v.0.48:

Extent \Ex*tent"\, a. [L. extentus, p. p. of extendere. See
   Extend.]
   Extended. [Obs.] --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Extent \Ex*tent"\, n. [L. extentus, fr. extendere. See
   Extend.]
   1. Space or degree to which a thing is extended; hence,
      superficies; compass; bulk; size; length; as, an extent of
      country or of line; extent of information or of charity.
      [1913 Webster]

            Life in its large extent is scare a span. --Cotton.
      [1913 Webster]

   2. Degree; measure; proportion. "The extent to which we can
      make ourselves what we wish to be." --Lubbock.
      [1913 Webster]

   3. (Eng. Law)
      (a) A peculiar species of execution upon debts due to the
          crown, under which the lands and goods of the debtor
          may be seized to secure payment.
      (b) A process of execution by which the lands and goods of
          a debtor are valued and delivered to the creditor.
          [1913 Webster]

WordNet (r) 3.0 (2006):

extent
    n 1: the point or degree to which something extends; "the extent
         of the damage"; "the full extent of the law"; "to a certain
         extent she was right"
    2: the distance or area or volume over which something extends;
       "the vast extent of the desert"; "an orchard of considerable
       extent"