man·u·mis·sion /ˌmænjəˈmɪʃən/
  解放,解放證書,釋放令
  Man·u·mis·sion n.  The act of manumitting, or of liberating a slave from bondage. “Given to slaves at their manumission.”
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  manumission
       n : the formal act of freeing from slavery; "he believed in the
           manumission of the slaves"