radiation
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- (1) The emission and propagation of waves transmitting energy through space or through some medium; for example, the emission and propagation of electromagnetic, sound, or elastic waves. (2) The energy transmitted by waves through space or some medium; when unqualified, usually refers to electromagnetic radiation. Also known as radiant energy. (3) A stream of particles, such as electrons, neutrons, protons, alpha particles, or high-energy photons, or a mixture of these. (See Ionizing Radiation, Nuclear Radiation, and Thermal Radiation.)
DoD Missile Defense Agency - Cite This Source - This Definition - Coherence, CRT, Electromagnetic Radiation (EMR), gamma ray, ionizing radiation, Nuclear Radiation, Radioactivity, Scattering, Thermal X-Rays, Ultraviolet (UV), X-Rays
- In communication, the emission of energy in the form of electromagnetic waves. 2. The outward flow of energy from any source in the form of radio waves. [NTIA] [RR]
ATIS - Cite This Source - This Definition - antenna, field-disturbance sensor, homing, horn, incidental-radiation device, low-power communication device, radio beam, radio equipment, reradiation