A believer in or adherent of dyothelism; a person who maintains that Christ had two distinct wills, one divine and one human.
From dyothelete with the addition of '-ian' suffix, creating an agent noun similar to 'historian' or 'mathematician.' The suffix emphasizes adherence to this specific theological position.
By using '-ian,' religious communities could identify followers of a specific belief the same way we talk about 'Lutherans' or 'Calvinists'—it made theological positions feel like actual organized movements!
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