Invocation

n. cry, supplication, request for help or protection (made to a deity); prayer; request, earnest appeal, entreaty; summoning of a spirit; incantation

Invocation can also mean starting computer software. See execution (computers) and invocational media. For the 2001 album by the band Canvas see Invocation (album). An invocation (from the Latin verb invocare "to call on, invoke") may take the form of:Supplication or prayer.A form of possession.Command or conjuration.Self-identification with certain spirits.
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Noun
1. a prayer asking God's help as part of a religious service
(synonym) supplication
(hypernym) prayer, petition, orison
(hyponym) rogation
(part-holonym) service, religious service, divine service
(derivation) appeal, invoke
2. an incantation used in conjuring or summoning a devil
(hypernym) incantation, conjuration
(derivation) raise, conjure, conjure up, invoke, evoke, stir, call down, arouse, bring up, put forward, call forth
3. calling up a spirit or devil
(synonym) conjuring, conjuration, conjury
(hypernym) magic
(hyponym) evocation, summoning
(derivation) raise, conjure, conjure up, invoke, evoke, stir, call down, arouse, bring up, put forward, call forth
4. the act of appealing for help
(hypernym) implementation, effectuation
(derivation) appeal, invoke

n. invocation

(n.)
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.
  

(n.)
A call or summons; especially, a judicial call, demand, or order; as, the invocation of papers or evidence into court.