The Collaborative International Dictionary of English v.0.48:

Allotment \Al*lot"ment\, n. [Cf. OF. alotement, F. allotement.]
   1. The act of allotting; assignment.
      [1913 Webster]

   2. That which is allotted; a share, part, or portion granted
      or distributed; that which is assigned by lot, or by the
      act of God; anything set apart for a special use or to a
      distinct party.
      [1913 Webster]

            The alloments of God and nature.      --L'Estrange.
      [1913 Webster]

            A vineyard and an allotment for olives and herbs.
                                                  --Broome.
      [1913 Webster]

   3. (law) The allowance of a specific amount of scrip or of a
      particular thing to a particular person.
      [1913 Webster]

   Cottage allotment, an allotment of a small portion of land
      to a country laborer for garden cultivation. [Eng.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

allotment
    n 1: a share set aside for a specific purpose [syn: allotment,
         allocation]
    2: the act of distributing by allotting or apportioning;
       distribution according to a plan; "the apportionment of seats
       in the House of Representatives is based on the relative
       population of each state" [syn: allotment, apportionment,
       apportioning, allocation, parceling, parcelling,
       assignation]