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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Measuring a galaxy's redshift tells how long ago its light was emitted.
Redshift shows the spacetime between galaxies is expanding.
The amount of a galaxy's redshift tells astronomers how fast the galaxy is
  moving away from us.
Over vast distances in the universe, this predicts that redshift of the gauge
  bosons weakens the gravitational coupling constant.
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