The Collaborative International Dictionary of English v.0.48:

Jactitation \Jac"ti*ta"tion\, n. [L. jactitare to utter in
   public, from jactare. See Jactancy.]
   [1913 Webster]
   1. (Law) Vain boasting or assertions repeated to the
      prejudice of another's right; false claim. --Mozley & W.
      [1913 Webster]

   2. (Med.) A frequent tossing or moving of the body;
      restlessness, as in delirium. --Dunglison.
      [1913 Webster]

   Jactitation of marriage (Eng. Eccl. Law), a giving out or
      boasting by a party that he or she is married to another,
      whereby a common reputation of their matrimony may ensue.
      --Blackstone.
      [1913 Webster]

WordNet (r) 3.0 (2006):

jactitation
    n 1: speaking of yourself in superlatives [syn: boast,
         boasting, self-praise, jactitation]
    2: (law) a false boast that can harm others; especially a false
       claim to be married to someone (formerly actionable at law)
    3: (pathology) extremely restless tossing and twitching usually
       by a person with a severe illness [syn: jactitation,
       jactation]