Invoke, v. t. [imp. & p. p. Invoked; p. pr. & vb. n. Invoking.]
Etymology: [F. invoquer, L. invocare; pref. in- in, on + vocare to call, fr. vox voice. See Voice, and cf. Invocate.]
To call on for aid or protection; to invite earnestly or solemnly; to summon; to address in prayer; to solicit or demand by invocation; to implore; as, to invoke the Supreme Being, or to invoke His and blessing. Go, my dread lord, to your great grandsire's tomb, . . . Invoke his warlike spirit. Shak.
Shades of meaning
Fernald has no entry of its own for invoke; he lists it under pray.
He lists it without comment; the entries above explain its neighbors.