Englishfor English speakers
feedback
Noun
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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.
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The high-pitched noise that you can hear when there's a loop between a microphone and a speaker.
laser
Noun
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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
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The term laser originated as an acronym for "light amplification by stimulated emission of radiation".