Use when referring to things directly related to the Episcopal Church denomination only. The Episcopalian liturgy has its own unique elements.
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Not Interchangeable
Don't confuse with 'Episcopal'; 'Episcopalian' refers to the noun and adjective form relating to the church. He donated generously to the Episcopalian mission.
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Cultural Nuance
Being Episcopalian can imply certain cultural traditions in American society. The family follows Episcopalian holiday customs.