- 1a : the act or process of petitioning for help or support; specifically often capitalized : a prayer of entreaty (as at the beginning of a service of worship)
- b : a calling upon for authority or justification
As a supplication or prayer, invocation implies to call upon God, a god or goddess, a person, etc. When a person calls upon God, a god, or goddess to ask for something (protection, a favour, his/her spiritual presence in a ceremony, etc.) or simply for worship, this can be done in a pre-established form or with the invoker's own words or actions. An example of a pre-established text for an invocation is the Lord's Prayer.
All religions in general use invoking prayers, liturgies, or hymns; see for example the mantras in Hinduism and Buddhism, the Egyptian Coming Out by Day (aka Book of the Dead), the Orphic Hymns and the many texts, still preserved, written in cuneiform characters on clay tablets, addressed to Shamash, Ishtar, and other deities.