echo chamber

[ek-oh cheym-ber]
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noun

a room or other enclosed space that amplifies and reflects sound, generally used for broadcasting or recording echos or hollow sound effects: an open-air echo chamber;The hallway is a giant echo chamber.
an environment in which the same opinions are repeatedly voiced and promoted, so that people are not exposed to opposing views: an online echo chamber;We need to move beyond the echo chamber of our network to understand diverse perspectives.

Origin of echo chamber

An Americanism dating back to 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for echo chamber

echo chamber

noun

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 broadcastingAlso called: reverberation chamber
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012