To command or strongly appeal to someone under oath or by invoking something sacred or authoritative.
From Old French 'adjurer' and Latin 'adjurare' (to swear to or command), composed of 'ad-' (to) and 'jurare' (to swear).
To adjure someone is to treat the situation as so serious that regular language isn't enough—you invoke something sacred, divine, or authoritative to compel obedience, which is why the word carries an almost magical weight in literature.
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