Emily Dickinson Lexicon

RA'DI-ANCE, or RADI-AN-CY, n. [L. radians, radio, to beam or shoot rays. See Radius and Ray.]

Properly, brightness shooting in rays or beams; hence in general, brilliant or sparkling luster; vivid brightness; as, the radiance of the sun. The Son / Girt with omnipotence, with radiance crown'd / Of majesty divine. – Milton.