1. (n.) The act of irradiating; emission of rays of light.

2. (n.) That which irradiates or is irradiated; luster; splendor; irradiation; brilliancy.

aroma aura breath definite odor detectable odor diffusion discharge dispersion ectoplasm ectoplasy effluvium emergence emersion emission essence exhalation exteriorized protoplasm extrusion flavor fragrance fume highlight illumination irradiance irradiancy irradiation issuance issue light light source luminous energy odor photosensitivity radiance radiancy radiant energy radiation radius ray redolence savor scattering scent sidelight smell spoke spoor stench subtle odor surfacing trace trail vent visible radiation whiff