redshift — English Dictionary

Noun

1. An increase in the wavelength of a photon or of light while in transit, corresponding to a lower frequency and a shift toward the red end of the electromagnetic spectrum.

   Usage

   • Countable
   • Uncountable

   Antonyms

   blueshift

Verb

1. (ergative) (said of light or a photon) To shift toward the red end of the electromagnetic spectrum while in transit; to change to a longer wavelength and a lower frequency.

   Antonyms

   blueshift

   Related words

   Doppler effect

Noun

1. (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum); generally interpreted as evidence that the universe is expanding

   Synonyms

   red shift

   Broader terms

   propagation