invocation

Short definition from Wiktionary

Noun

1. 1
   The act or form of calling for the assistance or presence of some superior being, especially prayer offered to a divine being.
2. 2
   A call or summons, especially a judicial call, demand, or order.
3. 3
   An act of invoking or claiming a legal right.
4. 4
   The act of invoking, such as a function call.