The Collaborative International Dictionary of English v.0.48:

Ecclesia \Ec*cle"si*a\, n.; pl. Ecclesi[ae]. [L., fr. Gr. ?.]
   1. (Gr. Antiq.) The public legislative assembly of the
      Athenians.
      [1913 Webster]

   2. (Eccl.) A church, either as a body or as a building.
      [1913 Webster]