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ecumenicism

[ek-yoo-men-uh-siz-uh m or, esp. British, ee-kyoo-]
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noun
  1. ecumenicalism; ecumenism.

Origin of ecumenicism

First recorded in 1960–65; ecumenic(al) + -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018