The Collaborative International Dictionary of English v.0.48:

Divorcement \Di*vorce"ment\, n.
   Dissolution of the marriage tie; divorce; separation.
   [1913 Webster]

         Let him write her a divorcement.         --Deut. xxiv.
                                                  1.
   [1913 Webster]

         The divorcement of our written from our spoken
         language.                                --R. Morris.
   [1913 Webster]

WordNet (r) 3.0 (2006):

divorcement
    n 1: the legal dissolution of a marriage [syn: divorce,
         divorcement]