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plural antechambers
A small room used as an entryway or reception area to a larger room. quotations examples
"This is merely the antechamber, the entrance hall," said Dumbledore after a moment or two.
2005 July 16, J. K. Rowling [pseudonym; Joanne Rowling], Harry Potter and the Half-Blood Prince (Harry Potter; 6), London: Bloomsbury Publishing