1. The act or an instance of invoking, especially an appeal to a higher power for assistance.
2. A prayer or other formula used in invoking, as at the opening of a religious service.
a. The act of conjuring up a spirit by incantation.
b. An incantation used in conjuring.
[Middle English invocacion, from Old French, from Latin invocātiō, invocātiōn-, from invocātus, past participle of invocāre, to invoke; see INVOKE.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.