The Collaborative International Dictionary of English v.0.48:

Ulterior \Ul*te"ri*or\, a. [L., comp. of ultra, ultro, beyond,
   on the other side, properly cases of an old adjective, formed
   with a comparative suffix, which is akin to OL. uls beyond,
   L. olim formerly, hereafter, orig., at that time, ille that,
   OL. olle, ollus. Cf. Outrage.]
   1. Situated beyond, or on the farther side; thither; --
      correlative with hither.
      [1913 Webster]

   2. Further; remoter; more distant; succeeding; as, ulterior
      demands or propositions; ulterior views; what ulterior
      measures will be adopted is uncertain.
      [1913 Webster]

   Ulterior motive, Ulterior object or Ulterior aim, a
      motive, object or aim beyond that which is avowed.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ulterior \Ul*te"ri*or\, n.
   Ulterior side or part. [R.] --Coleridge.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ulterior
    adj 1: lying beyond what is openly revealed or avowed
           (especially being kept in the background or deliberately
           concealed); "subterranean motives for murder"; "looked
           too closely for an ulterior purpose in all knowledge"-
           Bertrand Russell [syn: subterranean, subterraneous,
           ulterior]
    2: beyond or outside an area of immediate interest; remote; "a
       suggestion ulterior to the present discussion";
       "without...any purpose, immediate or ulterior"- G.B.Shaw
    3: coming at a subsequent time or stage; "without ulterior
       argument"; "the mood posterior to" [syn: later(a),
       ulterior, posterior]