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he electromagnetic field is a physical field produced by electrically charged objects. It affects the behavior of charged objects in the vicinity of the field.

The electromagnetic field extends indefinitely throughout space and describes the electromagnetic interaction. It is one of the four fundamental forces of nature (the others are gravitation, the weak interaction, and the strong interaction). The field propagates by electromagnetic radiation; in order of increasing energy (decreasing wavelength) electromagnetic radiation comprises: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

• he act or process of radiating: the radiation of heat and light from a fire.
• Physics.
  1. Emission and propagation and emission of energy in the form of rays or waves.
  2. Energy radiated or transmitted as rays, waves, in the form of particles.
  3. A stream of particles or electromagnetic waves emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.
  4. 1. The act of exposing or the condition of being exposed to such energy.
     2. The application of such energy, as in medical treatment.
     3. Anatomy. Radial arrangement of parts, as of a group of nerve fibers connecting different areas of the brain.
     4. 1. The spread of a group of organisms into new habitats.
        2. Adaptive radiation.