They set forward; and, with a grandeur of air, a dignified step, which caught the eye, but could not shake the doubts of the well-read Catherine, he led the way across the hall, through the common drawing-room and one useless antechamber, into a room magnificent both in size and furniture—the real drawing-room, used only with company of consequence.
There are no more uses of "antechamber" in the book.
Show samples from other sources
I was escorted to an antechamber where I waited almost an hour.
They went into the antechamber and there, sure enough, the two gentlemen-in-waiting were, sprawling on chairs and snoring hard.
C.S. Lewis -- Prince Caspian: The Return to Narnia