Uniatism

• a word derived from Uniat.
  Uniat

  adjective

  designating any of the Eastern Churches that retain their own liturgy but submit to papal authority
• a word derived from Uniate.
  Uniate

  noun

  a member of an Eastern church that is in union with the Roman Catholic Church, acknowledges the Roman pope as supreme in matters of faith, but maintains its own liturgy, discipline, and rite.

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