obsecration (n.)

late 14c., obsecracioun, "prayer, earnest entreaty," especially "a prayer of supplication," from Latin obsecrationem (nominative obsecratio) "a beseeching, imploring, supplication, entreaty," noun of action from past-participle stem of obsecrare "to beseech, entreat" (on religious grounds), from ob "in front of, before" (see ob-) + sacrare "to make or declare sacred" (see sacred).