- incident flux of radiant energy per unit area.
Origin of irradiance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for irradiance
Historical Examples of irradiance
- the radiant flux incident on unit area of a surface. It is measured in watts per square metreSymbol: E e Also called: irradiation Compare illuminance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for irradiance
1660s, from irradiant (1520s), from Latin irradiantem (nominative irradians), present participle of irradiare (see irradiate). Related: Irradiancy (1640s).
Online Etymology Dictionary, © 2010 Douglas Harper