Invocation

n.	1.
	1.	The act or form of calling for the assistance or presence of some superior being; earnest and solemn entreaty; esp., prayer offered to a divine being. Sweet invocation of a child; most pretty and pathetical! - Shak. The whole poem is a prayer to Fortune, and the invocation is divided between the two deities. - Addison.
	2.	(Law) A call or summons; especially, a judicial call, demand, or order; as, the invocation of papers or evidence into court.

Noun	1.	invocation - a prayer asking God's help as part of a religious service Synonyms: supplication
	2.	invocation - an incantation used in conjuring or summoning a devil
	3.	invocation - calling up a spirit or devil Synonyms: conjuring, conjury, conjuration
	4.	invocation - the act of appealing for help

Angelus, Ave, Ave Maria, Hail Mary, Kyrie Eleison, Paternoster, adjuration, agape, aid prayer, appeal, asperges, aspersion, auricular confession, bar mitzvah, bas mitzvah, beadroll, beads, beck, beck and call, benedicite, benediction, benison, beseechment, bid, bidding, bidding prayer, blessing, breviary, call, calling, calling forth, celebration, chaplet, circumcision, clamor, collect, communion, confession, confirmation, conjuration, conjurement, contemplation, convocation, cry, devotions, entreaty, evocation, exorcisation, exorcism, exsufflation, grace, high celebration, impetration, imploration, imploring, imprecation, incantation, incense, indent, intercession, invocation of saints, invocatory plea, kiss of peace, lesser litany, litany, love feast, lustration, meditation, nod, obsecration, obtestation, orison, pax, petition, plea, prayer, prayer wheel, preconization, processional, reciting the rosary, requisition, rogation, rosary, silent prayer, suit, summons, supplication, telling of beads, thanks, thanksgiving, the confessional, the confessionary