Source : Webster's Revised Unabridged Dictionary (1913)

Jactation \Jac*ta"tion\, n. [L. jactatio, fr. jactare: af. F.
   jactation. See {Jactancy}.]
   A throwing or tossing of the body; a shaking or agitation.
   --Sir. W. Temple.

Source : WordNet®

jactation
     n : (pathology) extremely restless tossing and twitching usually
         by a person with a severe illness [syn: {jactitation}]