obsecration /(ŏb`sē̇*krā"shŭn)/

ob·se·cra·tion

obsecration

n.
  1. The act of obsecrating or imploring; as, the obsecrations of the Litany, being those clauses beginning with “By.”
  2. A figure of speech in which the orator implores the assistance of God or man. (Rhet.)