ecumenic : Idioms & Phrases

• a title assumed by the popes.

Webster 1913

• noun (early Christian church) one of seven gatherings of bishops from around the known world under the presidency of the Pope to regulate matters of faith and morals and discipline
  
  • the first seven councils through 787 are considered to be ecumenical councils by both the Roman Catholic church and the Eastern Orthodox church but the next fourteen councils are considered ecumenical only by the Roman Catholic church

WordNet

• . See under Council.

Webster 1913