Source : Webster's Revised Unabridged Dictionary (1913)

Consociation \Con*so`ci*a"tion\, n. [L. consociatio.]
   1. Intimate union; fellowship; alliance; companionship;
      confederation; association; intimacy.

            A friendly consociation with your kindred elements.
                                                  --Warburton.

   2. A voluntary and permanent council or union of neighboring
      Congregational churches, for mutual advice and
      co["o]peration in ecclesiastical matters; a meeting of
      pastors and delegates from churches thus united.

   Note: In Connecticut some of the Congregational churhes are
         associated in consociations and the others in
         conferences.