# blueshift

> English word · Noun · IPA /ˈbluːˌʃɪft/

## Definitions
1. A decrease in the wavelength of a photon or of light, corresponding to a higher frequency and a shift toward the blue end of the electromagnetic spectrum.

## Etymology
From blue + shift.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/blueshift