A person who makes a solemn promise or takes an oath, especially in a legal or religious context.
From Latin 'adjurare' (ad- + jurare, 'to swear'), meaning to swear to something. The -er suffix denotes a person who performs the action. This term developed in medieval legal English when oaths were central to contracts and testimony.
In medieval courts, an adjurer's word was literally their bond—if they lied under oath, they could lose their hand or be executed. Today we've replaced that fear with fines and perjury charges, but the power of sworn testimony hasn't changed much.
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