Usually means: Increase in wavelength of light.
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We found 22 dictionaries that define the word redshift:

General (15 matching dictionaries)
  1. redshift: Merriam-Webster
  2. redshift: Oxford Learner's Dictionaries
  3. redshift: American Heritage Dictionary of the English Language
  4. redshift: Collins English Dictionary
  5. redshift: Vocabulary.com
  6. Redshift, redshift: Wordnik
  7. redshift: Wiktionary
  8. redshift: Webster's New World College Dictionary, 4th Ed.
  9. redshift: Infoplease Dictionary
  10. redshift: Dictionary.com
  11. RedShift (planetarium software), Redshift (Enter Shikari song), Redshift (disambiguation), Redshift (group), Redshift (planetarium software), Redshift (software), Redshift (theory), Redshift, The Redshift: Wikipedia, the Free Encyclopedia
  12. redshift: FreeDictionary.org
  13. redshift: TheFreeDictionary.com
  14. redshift: Wikimedia Commons US English Pronunciations
  15. redshift: Mnemonic Dictionary

Computing (1 matching dictionary)
  1. redshift: Encyclopedia

Science (4 matching dictionaries)
  1. Redshift: Eric Weisstein's World of Physics
  2. Imagine the Universe! Dictionary (No longer online)
  3. How Many? A Dictionary of Units of Measurement (No longer online)
  4. Redshift: Extragalactic Astronomy

Slang (1 matching dictionary)
  1. redshift: Urban Dictionary

Tech (1 matching dictionary)
  1. High-Energy Astrophysics (No longer online)

(Note: See redshifted as well.)

Definitions from Wiktionary (redshift)

noun:  (physics: astronomy, relativity) An increase in the wavelength of a photon or of light, corresponding to a lower frequency and a shift toward the red end of the electromagnetic spectrum.
verb:  (physics: astronomy, relativity) (ambitransitive) (said of light or a photon) To shift toward the red end of the electromagnetic spectrum; to change to a longer wavelength and a lower frequency.

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