1. (n.) 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.

2. (n.) A call or summons; especially, a judicial call, demand, or order; as, the invocation of papers or evidence into court.

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