Original: The Seventh-day Adventist Church (commonly abbreviated "Adventist" Although "SDA" is commonly used, "Adventist" is the church's own officially preferred abbreviation of "Seventh-day Adventist".
Simplified: The Seventh-day Adventist (abbreviated "Adventist" Although "SDA" is commonly used, "Adventist" is the church's own officially preferred abbreviation of "Seventh-day Adventist".