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1. A room or enclosure with acoustically reflective walls used in broadcasting and recording to produce echoes or similar sound effects.
2. An institution or environment in which one set of views predominates and dissenting viewpoints are squelched, ridiculed, or ignored: "Napoleon's vision of himself as a 'superior man' had been confirmed to him time and again by events and by the echo chamber of his own propaganda machine" (David A. Bell).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(General Engineering) a room with walls that reflect sound. It is used to make acoustic measurements and as a source of reverberant sound to be mixed with direct sound for recording or broadcasting. Also called: reverberation chamber
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a room or studio with resonant walls for broadcasting or recording echoes or hollow sound effects.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
A group of bloggers that repeat and reinforce each others opinions.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited