Consociation /(?)/

Con·so·ci·a·tion

Consociation

n.
  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 cooperation in ecclesiastical matters; a meeting of pastors and delegates from churches thus united.