The Collaborative International Dictionary of English v.0.48:

Assignation \As`sig*na"tion\, n. [L. assignatio, fr. assignare:
   cf. F. assignation.]
   1. The act of assigning or allotting; apportionment.
      [1913 Webster]

            This order being taken in the senate, as touching
            the appointment and assignation of those provinces.
                                                  --Holland.
      [1913 Webster]

   2. An appointment of time and place for meeting or interview;
      -- used chiefly of love interviews, and now commonly in a
      bad sense.
      [1913 Webster]

            While nymphs take treats, or assignations give.
                                                  --Pope.
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   3. A making over by transfer of title; assignment.
      [1913 Webster]

   House of assignation, a house in which appointments for
      sexual intercourse are fulfilled.
      [1913 Webster]

WordNet (r) 3.0 (2006):

assignation
    n 1: a secret rendezvous (especially between lovers) [syn:
         assignation, tryst]
    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]