The word "invocation" is correct and usable in written English.
It can be used to refer to a verbal appeal to a deity, spirit, or person for aid or inspiration. For example: We recited a powerful invocation to the gods in order to bring us luck.
When the last clouds wagon-train off, loincloth and invocation will be the one hope for last woman and last man discovering she's pregnant.
He laid about Chris Anderson's airy invocation of internet connectedness as though critiquing a disappointing undergraduate essay.
Any discussion of floods in Mumbai begins with a ritual invocation of one fateful date: 26 July 2005.
The giveway came in David Dimbleby's invocation, at different times in his BBC commentary, of the funerals of Nelson, Wellington and Churchill.
But the naked appeal to popular nationalism and the invocation of the goal of national strength send an awkward message to China's neighbours.
As it happens, despite Mr Schröder's recent invocation of Iran, there is little chance of its being a rerun of September 2002, when he came from behind to snatch a narrow victory.
Mr Jospin, bolstered by his reputation for Protestant integrity, primly says that no one from the highest to the lowest should benefit from "zero impunity", a reference to Mr Chirac's invocation of presidential immunity.But scandal-mongering is something Mr Chirac is adept at facing down.
The Met's defence was that the actual target of its invocation of the Official Secrets Act was the indiscreet police officer.
Film credits usually end with the invocation: "To God Be the Glory".
A programmer may approach the virtual desk, and with the right identification and invocation, receive materials for use on his site.
Janet Ainsworth, previously a defence attorney and now an academic at the Seattle University School of Law, points out that, in order to get a lawyer, suspects have to use a "direct, unmediated and unhedged invocation", such as: "I want a lawyer and I won't talk to you without one".
