not guilty

1 :  a plea by a criminal defendant who intends to contest the charges — compare guilty, nolo contendere Editor's note: Under the Federal Rules of Criminal Procedure, if a defendant refuses to plead or if the defendant is a corporation that fails to appear the court must enter a plea of not guilty on the defendant's behalf.

2 :  a verdict rendered by a jury acquitting a criminal defendant upon finding that the prosecution has not proven the defendant's guilt beyond a reasonable doubt