Noah Webster's 1828 American Dictionary of the English Language is regarded by many as the finest English
dictionary ever published. The dictionary is available in many forms. I made the content available here for my own purposes,
out of personal admiration for this particular dictionary.
RADIA'TION, n. [L. radiatio.] 1. The emission and diffusion of rays of light; beamy brightness. 2. The shooting of any thing from a center, like the diverging rays of light.