echo chamber

American  

[ek-oh cheym-ber] / ˈɛk oʊ ˌtʃeɪm bər /

noun

1. a room or other enclosed space that amplifies and reflects sound, generally used for broadcasting or recording echos or hollow sound effects: The hallway is a giant echo chamber.

   an open-air echo chamber;

   The hallway is a giant echo chamber.

2. an environment in which the same opinions are repeatedly voiced and promoted, so that people are not exposed to opposing views: We need to move beyond the echo chamber of our network to understand diverse perspectives.

   an online echo chamber;

   We need to move beyond the echo chamber of our network to understand diverse perspectives.

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echo chamber British  

noun

1. Also called: reverberation chamber.  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

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Etymology

Origin of echo chamber

An Americanism dating back to 1935–40

Example Sentences

The board's apparent belief that nothing is as bad as it seems and that fans need to understand how lucky they are gets them nowhere - only further ensconced in their own echo chamber.

From BBC

Therapy, once a space for cognitive restructuring, has in some quarters become an echo chamber for emotion.

From The Wall Street Journal

The effect, they say, was to create an echo chamber: When both a trusted financial adviser and a lawyer repeated the same message, it reinforced Puech’s belief in what he was being told.

From The Wall Street Journal

Rarely is the ridiculous performance revealed to their own echo chamber.

From Salon

If a teen wants to be tapped into the digital echo chamber, they have to know what it can do to them.

From Salon