Webster's Revised Unabridged Dictionary · 1913

Adjuration

Adjuration ({not transcribed}) , noun

[Latin adjuratio, from adjurare: compare French adjuration. See Adjure.]

1.
The act of adjuring; a solemn charging on oath, or under the penalty of a curse; an earnest appeal.
What an accusation could not effect, an adjuration shall. — Bp. Hall
2.
The form of oath or appeal.
Persons who... made use of prayer and adjurations. — Addison