Source : Webster's Revised Unabridged Dictionary (1913)

Non prosequitur \Non" pro*seq"ui*tur\ [L. he does not
   prosecute.] (Law)
   A judgment entered against the plaintiff in a suit where he
   does not appear to prosecute. See {Nolle prosequi}.

Source : WordNet®

non prosequitur
     n : a judgment entered in favor of the defendant when the
         plaintiff has not continued his action (e.g., has not
         appeared in court) [syn: {non pros}]