# irradiance

> English word · Noun · IPA /ɪˈɹeɪ.di.əns/ · frequency rank #71,598

## Definitions
1. The act of irradiating; emission of rays of light.
2. That which irradiates or is irradiated; lustre; splendour; brilliancy.
3. The radiant power received by unit area of surface.

## Etymology
irradiant + -ance

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