Source : Webster's Revised Unabridged Dictionary (1913)

Retrial \Re*tri"al\, n.
   A secdond trial, experiment, or test; a second judicial
   trial, as of an accused person.

Source : WordNet®

retrial
     n : a new trial in which issues already litigated and to which
         the court has already rendered a verdict or decision are
         reexamined by the same court; occurs when the initial
         trial is found to have been improper or unfair due to
         procedural errors