The Collaborative International Dictionary of English v.0.48:

Admeasure \Ad*meas"ure\ (?; 135), v. t. [Cf. OF. amesurer, LL.
   admensurare. See Measure.]
   1. To measure.
      [1913 Webster]

   2. (Law) To determine the proper share of, or the proper
      apportionment; as, to admeasure dower; to admeasure common
      of pasture. --Blackstone.
      [1913 Webster]

   2. The measure of a thing; dimensions; size.
      [1913 Webster]

   3. (Law) Formerly, the adjustment of proportion, or
      ascertainment of shares, as of dower or pasture held in
      common. This was by writ of admeasurement, directed to the
      sheriff.
      [1913 Webster]

WordNet (r) 3.0 (2006):

admeasure
    v 1: determine the quantity of someone's share