n. 1 the act or an instance of invoking, esp. in prayer. 2 an appeal to a supernatural being or beings, e.g. the Muses, for psychological or spiritual inspiration. 3 Eccl. the words 'In the name of the Father' etc. used as the preface to a sermon etc. invocatory adj.
[ ME f. OF f. L invocatio -onis (as INVOKE) ]