Antechamber

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Antechamber

A room that serves both as a waiting area as well as an entrance to a larger room.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

antechamber

1. A room preceding a chamber.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.