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.
2. Further; remoter; more distant; succeeding; as, ulterior
demands or propositions; ulterior views; what ulterior
measures will be adopted is uncertain.
Ulterior motive, Ulterior object or Ulterior aim, a
motive, object or aim beyond that which is avowed.