The Collaborative International Dictionary of English v.0.48:

Salivation \Sal`i*va"tion\, n. [L. salivatio: cf. F.
   salivation.] (Physiol.)
   The act or process of salivating; an excessive secretion of
   saliva, often accompanied with soreness of the mouth and
   gums; ptyalism.
   [1913 Webster]

   Note: It may be induced by direct chemical or mechanical
         stimulation, as in mastication of some tasteless
         substance like rubber, or indirectly by some agent
         which affects the whole system, as mercury compounds.
         [1913 Webster]

WordNet (r) 3.0 (2006):

salivation
    n 1: the secretion of saliva