To sleep under the stars, to drink nothing but well water and to live chiefly on nuts and wild fruit, was a strange experience for Caspian after his bed with silken sheets in a tapestried chamber at the castle, with meals laid out on gold and silver dishes in the anteroom, and attendants ready at his call.
There are no more uses of "anteroom" in the book.
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He was searched again in the anteroom before entering her office.
She kept me waiting an hour in the anteroom for my long-scheduled ten minute appointment.