ADJURATION
adjuration
(noun) a solemn and earnest appeal to someone to do something
Source: WordNet® 3.1
Etymology
Noun
adjuration (countable and uncountable, plural adjurations)
A grave warning.
A solemn oath.
Source: Wiktionary
Ad`ju*ra"tion, n. Etym: [L. adjuratio, fr. adjurare: cf. F.
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.
Source: Webster’s Unabridged Dictionary 1913 Edition