Irradiance

//ɪˈɹeɪ.di.əns// noun

noun ·Rare ·Advanced level

Definitions

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

    "The geometry of the cone θ and the irradiance at the image of the carbon block were used to determine the absolute steradiancy of the energy in the cone θ as a radiometer calibration value."

Synonyms

All synonyms
emanationhighlightilluminationirradiancyirradiationradiance

Example

More examples

"This December, NASA is launching an instrument to the International Space Station to continue monitoring the Sun’s energy input to the Earth system. The Total and Spectral solar Irradiance Sensor (TSIS-1) will precisely measure what scientists call “total solar irradiance.”"

Etymology

irradiant + -ance

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.