/ əˈdʒʊə(r); NAmE əˈdʒʊr/ verb
[ vn to inf ] ( formal ) to ask or to order sb to do sth :
He adjured them to tell the truth.
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WORD ORIGIN
late Middle English (in the sense put a person on oath ): from Latin adjurare , from ad- to + jurare swear (from jus , jur- oath).