Source : Webster's Revised Unabridged Dictionary (1913)

Coparcener \Co*par"ce*ner\ (-n[~e]r), n. [Pref. co- + parcener.]
   (Law)
   One who has an equal portion with others of an inheritance.

         All the coparceners together make but one heir, and
         have but one estate among them.          --Blackstone.