radiancy

ra·di·an·cy

[rey-dee-uhn-see]
noun, plural ra·di·an·cies.

Origin:
1640–50; radi(ant) + -ancy

non·ra·di·an·cy, noun
sub·ra·di·an·cy, noun
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
radiance or radiancy (ˈreɪdɪəns) [Click for IPA pronunciation guide]
 
n , pl -ances, -ancies
1.  the quality or state of being radiant
2.  Le a measure of the amount of electromagnetic radiation leaving or arriving at a point on a surface. It is the radiant intensity in a given direction of a small element of surface area divided by the orthogonal projection of this area onto a plane at right angles to the direction
 
radiancy or radiancy
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Radiancy is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a scrap or morsel of food left at a meal.
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