feedback

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Noun

Singular feedback

Plural none

1. (uncountable) A reaction or opinion of something.

   I'd really like some feedback on my poem.

   I've been hearing really positive feedback about the new library.

   After you hand in your essay, I will give you your grade and feedback regarding the content.

2. (uncountable) The high-pitched noise that you can hear when there's a loop between a microphone and a speaker.