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cosmic background radiation

noun, Astronomy.
electromagnetic radiation coming from every direction in the universe, considered the remnant of the big bang and corresponding to the black-body radiation of 3 K, the temperature to which the universe has cooled.
Also called cosmic microwave background. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Contemporary definitions for cosmic microwave background

microwave radiation in the universe, produced during the Big Bang and subsequently thinned and cooled as the universe expanded; also called background radiation

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science's 21st Century Lexicon
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cosmic microwave background in Science
cosmic background radiation  
Weak radio-frequency radiation traveling through outer space with equal intensity in every direction. It is thought to be residual radiation from a period shortly following the big bang, when the universe was very hot. Also called microwave background.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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cosmic microwave background in Culture

cosmic microwave background definition

The microwave radiation that arrives at the Earth from every direction in space. The detection of this radiation played an important role in acceptance of the Big Bang theory.

Note: This radiation is sometimes referred to as the “echo” of the Big Bang.
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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