Definition of "redshift" in English

noun

1. (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

1. (physics: astronomy, relativity) (ergative) (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.