Learn how to say Ecumenically correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word ecumenical:
representing a number of different Christian Churches:
he was a member of ecumenical committees
promoting or relating to unity among the world’s Christian Churches:
the ecumenical movement
late 16th century (in the sense ‘belonging to the universal Church’): via late Latin from Greek oikoumenikos from oikoumenē ‘the (inhabited) earth’