They walked for about ten minutes until they reached a place where the trees stood so closely together that it was as dark as twilight and there was no snow at all on the ground.
Twilight fell: the sky was turning to a light, dusky purple littered with tiny silver stars, and soon only the lights of Muggle towns gave them any clue of how far from the ground they were, or how very fast they were travelling.
He swished his long palomino tail, raised his hand towards the leafy canopy overhead, then lowered it slowly, and as he did so, the light in the room dimmed, so that they now seemed to be sitting in a forest clearing by twilight, and stars appeared on the ceiling.
There are no more uses of "twilight" in the book.
Show samples from other sources
It is a beautiful picture taken in twilight.
I awakened to a twilight sky, but did not know if the sun was setting or rising.