noun Astronomy.
a shift toward longer wavelengths of the spectral lines emitted by a celestial object that is caused by the object moving away from the earth.
Also, red shift.

1920–25; red1 + shift Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
redshift (ˈredˌʃɪft)
Compare: blueshift a shift in the lines of the spectrum of an astronomical object towards a longer wavelength (the red end of an optical spectrum), relative to the wavelength of these lines in the terrestrial spectrum, usually as a result of the Doppler effect caused by the recession of the object

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Main Entry:  red shift
Part of Speech:  n
Definition:  in astronomy, an increase in the wavelength of radiation emitted by astronomical objects, causing a shift of features in their spectra towards longer wavelengths due to their recession from the observer
Usage:  science's 21st Century Lexicon
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American Heritage
Science Dictionary
red shift  
See under Doppler effect.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

red shift definition

In physics, the reddening of light sent out by an object that is moving away from an observer. (See Doppler effect.)

Note: The red shift that can be observed in light from distant galaxies suggests that the universe is expanding, and thus supports the Big Bang theory.
The American Heritage® 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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Example sentences
Gravitational red shift wavelength dilation proves gravity is produced by the
  absorption of time by matter.
The universe does not expand the observed red shift has wrongly been
In a discontinuous universe there are other reasons for the red shift and
  background radiation.
Alternate explanations emerge naturally for the red shift and background
  radiation in a discontinuous universe.
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