The act or an instance of invoking, especially an appeal to a higher power for assistance.
A prayer or other formula used in invoking, as at the opening of a religious service.
The act of conjuring up a spirit by incantation.
An incantation used in conjuring.
[Middle English invocacion, from Old French, from Latin invocātiō, invocātiōn-, from invocātus, past participle of invocāre, to invoke; see invoke.] in'vo·ca'tion·al adj.
(ĭn'və-kā'shən) 