red·​shift ˈred-ˈshift How to pronounce redshift (audio)
: a displacement of the spectrum of a celestial body toward longer wavelengths that is a consequence of the Doppler effect or the gravitational field of the source
also : a measurement of a celestial body's redshift equal to the ratio of the displacement of a spectral line to its known unshifted wavelength and used especially to calculate the body's distance from earth
redshifted adjective

Examples of redshift in a Sentence

Recent Examples on the Web Ultimately, the project found and studied more than 1,500 of the telltale stellar explosions, many of them with high redshifts from the far depths of the cosmos. Ashley Balzer Vigil, Scientific American, 24 Jan. 2024 But even that was not enough: although clever automation saves time in the initial selection of candidates, determining each one’s redshift typically requires getting more data. Ashley Balzer Vigil, Scientific American, 24 Jan. 2024 The goal would be to use some combination of high redshift SNe, baryon acoustic oscillations (BAO), and weak lensing to constrain the parameters of dark energy. Discover Magazine, 19 Nov. 2019 Not only is the AMOLED screen's clean interface bright and easy to read in challenging lighting, but the flashlight and redshift mode make training at night a cinch too. Matt Jancer, WIRED, 3 Jan. 2024 In the very nearby universe, objects have a redshift of nearly zero; high-redshift objects, such as A2744_YD4 with its redshift of 8.38, are extremely far away (the exact distance depends on the expansion history of the universe). Alison Klesman, Discover Magazine, 10 Mar. 2017 One simulation could create such galaxies at a redshift of 13, the same as what JADES saw, and two others could build the galaxies at an even higher redshift. Quanta Magazine, 20 Jan. 2023 The two teams in the 1990s chose to plot redshift (velocity) on the x axis and apparent magnitude (distance) on the y axis. Richard Panek, Scientific American, 14 Nov. 2023 Objects at higher redshifts are significantly older and farther away. WIRED, 5 Nov. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'redshift.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1923, in the meaning defined above

Time Traveler
The first known use of redshift was in 1923

Dictionary Entries Near redshift

Cite this Entry

“Redshift.” Dictionary, Merriam-Webster, Accessed 22 May. 2024.

Kids Definition


red·​shift ˈred-ˈshift How to pronounce redshift (audio)
: displacement of a spectrum especially of a heavenly body toward longer wavelengths

More from Merriam-Webster on redshift

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