Source : Webster's Revised Unabridged Dictionary (1913)

Ataxia \A*tax"i*a\, Ataxy \At"ax*y\, n. [NL. ataxia, Gr. ?, fr.
   ? out of order; 'a priv. + ? ordered, arranged, ? to put in
   order: cf. F. ataxie.]
   1. Disorder; irregularity. [Obs.] --Bp. Hall.

   2. (Med.)
      (a) Irregularity in disease, or in the functions.
      (b) The state of disorder that characterizes nervous
          fevers and the nervous condition.

   {Locomotor ataxia}. See {Locomotor}.

Source : WordNet®

ataxia
     n : inability to coordinate voluntary muscle movements; unsteady
         movements and staggering gait [syn: {ataxy}, {dyssynergia},
          {motor ataxia}]