The Collaborative International Dictionary of English v.0.48:

Associable \As*so"cia*ble\, a. [See Associate.]
   1. Capable of being associated or joined.
      [1913 Webster]

            We know feelings to be associable only by the proved
            ability of one to revive another.     --H. Spencer.
      [1913 Webster]

   2. Sociable; companionable. [Obs.]
      [1913 Webster]

   3. (Med.) Liable to be affected by sympathy with other parts;
      -- said of organs, nerves, muscles, etc.
      [1913 Webster]

            The stomach, the most associable of all the organs
            of the animal body.                   --Med. Rep.
      [1913 Webster]

WordNet (r) 3.0 (2006):

associable
    adj 1: capable of being associated; "words associable with
           politics"