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]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "jactitation":
   ague, bluster, boast, boastfulness, boasting, bombast, brag,
   braggadocio, braggartism, bragging, bravado, bumpiness, chattering,
   chorea, cold shivers, conceit, fanfaronade, fits and starts,
   gasconade, gasconism, heroics, jactation, jerkiness, joltiness,
   palsy, quaking, quavering, quivering, rodomontade, shakes, shaking,
   shivering, shivers, shuddering, side, spasms, succussion, swagger,
   trembling, tremulousness, vanity, vaunt, vauntery, vaunting,
   vibration



Bouvier's Law Dictionary, Revised 6th Ed (1856):

JACTITATION. OF MARRIAGE, Eng. eccl. law. The boasting by an individual that
he or she has married another, from which it may happen that they will
acquire the reputation of being married to each other.
     2. The ecclesiastical courts may in such cases entertain a libel by the
party injured; and, on proof of the facts, enjoin the wrong-doer to
perpetual silence; and, as a punishment, make him pay the costs. 3 Bl. Com.
93; 2 Hagg. Cons. R. 423 Id. 285; 2 Chit. Pr. 459.