Ecumenical means "worldwide," from the Greek oikoumene, "the whole inhabited earth." The term is used most commonly to refer to the Christian ecumenical movement which, in the 20th century, has brought Christian churches together from across the lines of confession and denomination and from around the world to seek common fellowship and address common issues. As other religious traditions begin to explore their own intenal differences and commonalities, the term "ecumenical" is sometimes adopted, as in the efforts towrd pan-Buddhist ecumenical relations in the U.S.