radiancy

English

Etymology

From radiant +‎ -ancy.

Noun

radiancy (countable and uncountable, plural radiancies)

1. The property of being radiant; radiance
   • 1866, John Mason Neale, The Invalid's Hymn-book:

     What radiancy of glory, / What light beyond compare!

2. (physics) The amount of energy emitted, flux.