ecumenical
Concise Oxford English Dictionary © 2008 Oxford University Press:
ecumenical /ˌiːkjʊˈmɛnɪk(ə)l, ɛk-/
▶adjective representing a number of different Christian Churches.
■ promoting or relating to unity among the world's Christian Churches.
– derivatives
ecumenically adverb,
ecumenism /ɪˈkjuːmənɪz(ə)m/ noun.
ecumenically adverb,
ecumenism /ɪˈkjuːmənɪz(ə)m/ noun.
– origin C16: via late L. from Gk oikoumenikos from oikoumenē ‘the (inhabited) earth’.
'ecumenical' also found in these Oxford entries:

