ecumenicalism

[ ek-yoo-men-i-kuh-liz-uh m or, esp. British, ee-kyoo- ]
/ ˌɛk yʊˈmɛn ɪ kəˌlɪz əm or, esp. British, ˌi kyʊ- /

noun

the doctrines and practices of the ecumenical movement.
Also ecumenicism.

Origin of ecumenicalism

First recorded in 1945–50; ecumenical + -ism