# irradiation

> English word · Noun · IPA /ɪˌɹeɪdiˈeɪʃən/ · frequency rank #25,804

## Definitions
1. An act of irradiating, or state of being irradiated.
2. An act of irradiating, or state of being irradiated.
3. illumination; irradiance; brilliance.
4. mental light or illumination.
5. The apparent enlargement of a bright object seen upon a dark ground, due to the fact that the portions of the retina around the image are stimulated by the intense light; as when a dark spot on a white ground appears smaller, or a white spot on a dark ground larger, than it really is, especially when a little out of focus.

## Etymology
From Middle French irradiacion, from Latin irradiatio. Morphologically irradiate + -ion.

## Common misspellings (14)
`iradiation`, `irardiation`, `irradaition`, `irraddiation`, `irradiaiton`, `irradiasion`, `irradiatino`, `irradiationn`, `irradiatoin`, `irradiattion`, `irraditaion`, `irraidation`, `irrdaiation`, `riradiation`

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