Source : Webster's Revised Unabridged Dictionary (1913)

Perjury \Per"ju*ry\, n.; pl. {Perjuries}. [L. perjurium. See
   {Perjure}, v.]
   1. False swearing.

   2. (Law) At common law, a willfully false statement in a fact
      material to the issue, made by a witness under oath in a
      competent judicial proceeding. By statute the penalties of
      perjury are imposed on the making of willfully false
      affirmations.

   Note: If a man swear falsely in nonjudicial affidavits, it is
         made perjury by statute in some jurisdictions in the
         United States.

Source : WordNet®

perjury
     n : criminal offense of making false statements under oath [syn:
          {bearing false witness}, {lying under oath}]