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Webster 1913 Edition

{

(ĭr-rā′dĭ-ans)

(ĭr-rā′dĭ-an-sy̆)

, }

Noun.

[From

The act of irradiating; emission of rays of light.

That which irradiates or is irradiated; luster; splendor; irradiation; brilliancy.

Milton.

irradiancy ‎(countable and uncountable, plural irradiancies)