ac·quit·tance /əˈkwɪtṇ(t)s/
  解除,償清,清還證明書
  Ac·quit·tance n.
  1. The clearing off of debt or obligation; a release or discharge from debt or other liability.
  2. A writing which is evidence of a discharge; a receipt in full, which bars a further demand.
  You can produce acquittances
  For such a sum, from special officers.   --Shak.
  Ac·quit·tance, v. t. To acquit. [Obs.]
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  acquittance
       n : a legal document evidencing the discharge of a debt or
           obligation [syn: release]