What does adjure mean?
The definition of adjure
Ad*jure”, v. t.
[imp. & p. p. Adjured; p. pr. & vb. n. Adjuring].
Etym: [L. adjurare, adjurdium, to swear to; later, to adjure: cf. F. adjurer. See Jury.]

To charge, bind, or command, solemnly, as if under oath, or under the penalty of a curse; to appeal to in the most solemn or impressive manner; to entreat earnestly. Joshua adjured them at that time, saying, Cursed be the man before the Lord, that riseth up and buildeth this city Jericho. Josh. vi.
26 The high priest . . . said . . . I adjure thee by the living God, that thou tell us whether thou be the Christ. Matt. xxvi. 63. The commissioners adjured them not to let pass so favorable an opportunity of securing their liberties. Marshall.