A steady droning sound of many men chanting each to himself some weird incantation came out from the black, flat wall of the woods as the humming of bees comes out of a hive, and had a strange narcotic effect upon my half-awake senses.
This alone, I was convinced, had driven him out to the edge of the forest, to the bush, towards the gleam of fires, the throb of drums, the drone of weird incantations; this alone had beguiled his unlawful soul beyond the bounds of permitted aspirations.
There are no more uses of "incantation" in the book.
Show samples from other sources
She believes in the power of magical incantations.
Harry Potter says the incantation, "expecto patronum" as he focuses on a happy memory to summon protection from dark magic.