Source : Webster's Revised Unabridged Dictionary (1913)

Stimulate \Stim"u*late\, v. t. [imp. & p. p. {Stimulated}; p.
   pr. & vb. n. {Stimulating}.] [L. stimulatus, p. p. of
   stimulare to prick or goad on, to incite, fr. stimulus a
   goad. See {Stimulus}.]
   1. To excite as if with a goad; to excite, rouse, or animate,
      to action or more vigorous exertion by some pungent motive
      or by persuasion; as, to stimulate one by the hope of
      reward, or by the prospect of glory.

            To excite and stimulate us thereunto. --Dr. J.
                                                  Scott.

   2. (Physiol.) To excite; to irritate; especially, to excite
      the activity of (a nerve or an irritable muscle), as by
      electricity.

   Syn: To animate; incite; encourage; impel; urge; instigate;
        irritate; exasperate; incense.

Source : WordNet®

stimulating
     adj 1: rousing or quickening activity or the senses; "a stimulating
            discussion" [ant: {unstimulating}]
     2: that stimulates; "stimulant phenomena" [syn: {stimulant}]
     3: making lively and cheerful; "the exhilarating effect of
        mountain air" [syn: {exhilarating}]