After musing for some minutes, the old gentleman walked, with the same meditative face, into a back anteroom opening from the yard; and there, retiring into a corner, called up before his mind’s eye a vast amphitheatre of faces over which a dusky curtain had hung for many years.
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.