'Radiation' definitions:

Definition of 'radiation'

From: WordNet
noun
Energy that is radiated or transmitted in the form of rays or waves or particles
noun
The act of spreading outward from a central source
noun
Syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours; "he was suffering from radiation" [syn: radiation sickness, radiation syndrome, radiation]
noun
The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay [syn: radiation, radioactivity]
noun
The spread of a group of organisms into new habitats
noun
A radial arrangement of nerve fibers connecting different parts of the brain
noun
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance [syn: radiotherapy, radiation therapy, radiation, actinotherapy, irradiation]

Definition of 'Radiation'

From: GCIDE
  • Radiation \Ra`di*a"tion\ (r[=a]`d[i^]*[=a]"sh[u^]n), n. [L. radiatio: cf. F. radiation.]
  • 1. The act of radiating, or the state of being radiated; emission and diffusion of rays of light; beamy brightness. [1913 Webster]
  • 2. The shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat. [1913 Webster]

Synonyms of 'radiation'

From: Moby Thesaurus