The Collaborative International Dictionary of English v.0.48:

Contenement \Con*ten"e*ment\ (k[o^]n*t[e^]n"[-e]*ment), n.
   [Pref. con- + tenement.] (Law)
   That which is held together with another thing; that which is
   connected with a tenement, or thing holden, as a certain
   quantity of land adjacent to a dwelling, and necessary to the
   reputable enjoyment of the dwelling; appurtenance. --Burrill.
   [1913 Webster]