n. The act of obsecrating; entreaty; supplication.n. In liturgics, one of the suffrages or versicles of the Litany beginning with the word by (or, in Latin, per); a petition of the Litany for deliverance from evil: as, “By thy baptism, fasting, and temptation,” the response being “Good Lord, deliver us.”n. In rhetoric, a figure in which the orator implores the help of God or man.