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late 14c., "exorcism," from Late Latin adjurationem (nominative adjuratio) "a swearing to," noun of action from past participle stem of adjurare (see adjure). Originally a term in exorcism (with conjuration). General sense is from 17c.
a solemn appeal whereby one person imposes on another the obligation of speaking or acting as if under an oath (1 Sam. 14:24; Josh. 6:26; 1 Kings 22:16). We have in the New Testament a striking example of this (Matt. 26:63; Mark 5:7), where the high priest calls upon Christ to avow his true character. It would seem that in such a case the person so adjured could not refuse to give an answer. The word "adjure", i.e., cause to swear is used with reference to the casting out of demons (Acts 19:13).