Invocation (noun)

1. The action or process of invoking something, especially a deity.
2. A formula or prayer for invoking a deity.

Origin:

Late middle english: from latin invocatio(n-), from the verb invocare (see invoke).

Examples:

1. The priest began the invocation to bless the food.
2. The invocation of divine assistance was a common practice among the ancient people.
3. She recited a powerful invocation to banish negativity.
4. The invocation of spirits is forbidden by the church.
5. The invocation of the gods was a frequent occurrence in pagan rituals.