Webster's Revised Unabridged Dictionary · 1913

Invocation

Invocation , noun

[French invocation, Latin invocatio.]

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! — Shakespeare
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.