The term is derived from the Greek oikoumen', "inhabited world." Ecumenical refers to the wholeness of the church. Ecumenical theology is theology especially concerned to recover visible unity for the whole church in the world.
Ecumenical, Ecumenical Theology
Glossary definitions provided courtesy of Church Publishing Incorporated, New York, NY,(All Rights reserved) from "An Episcopal Dictionary of the Church, A User Friendly Reference for Episcopalians," Don S. Armentrout and Robert Boak Slocum, editors.