The Collaborative International Dictionary of English v.0.48:

Ecumenic \Ec`u*men"ic\, Ecumenical \Ec`u*men"ic*al\, a. [L.
   oecumenicus, Gr. ? (sc. ?) the inhabited world, fr. ? to
   inhabit, from o'i^kos house, dwelling. See Economy.]
   General; universal; in ecclesiastical usage, that which
   concerns the whole church; as, an ecumenical council.
   [Written also [oe]cumenical.]
   [1913 Webster]

   Ecumenical Bishop, a title assumed by the popes.

   Ecumenical council. See under Council.
      [1913 Webster]