The Collaborative International Dictionary of English v.0.48:

Approvement \Ap*prove"ment\, n. [Obs.]
   1. Approbation.
      [1913 Webster]

            I did nothing without your approvement. --Hayward.
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   2. (Eng. Law) a confession of guilt by a prisoner charged
      with treason or felony, together with an accusation of his
      accomplish and a giving evidence against them in order to
      obtain his own pardon. The term is no longer in use; it
      corresponded to what is now known as turning king's (or
      queen's) evidence in England, and state's evidence in the
      United States. --Burrill. Bouvier.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Approvement \Ap*prove"ment\, n. (Old Eng. Law)
   Improvement of common lands, by inclosing and converting them
   to the uses of husbandry for the advantage of the lord of the
   manor. --Blackstone.
   [1913 Webster]