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penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei.

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an electromagnetic wave of high energy and very short wavelength, which is able to pass through many materials opaque to light.

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Ultraviolet waves have the next shortest wavelength after visible light. It is ultraviolet rays from the Sun that cause sunburns. We are protected from the Sun's ultraviolet rays by the ozone layer. Some insects, such as bumblebees, can see ultraviolet light. Ultraviolet light is used by powerful telescopes like the Hubble Space Telescope to see far away stars.

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Visible light is a form of electromagnetic (EM) radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves. Generally, visible light is defined as the wavelengths that are visible to most human eyes. ... This broad range of wavelengths is known as the electromagnetic spectrum.

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(of electromagnetic radiation) having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects.

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electromagnetic wave with a wavelength in the range 0.001–0.3 m, shorter than that of a normal radio wave but longer than those of infrared radiation. Microwaves are used in radar, in communications, and for heating in microwave ovens and in various industrial processes.

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An electromagnetic wave of a frequency between about 104 and 1011 or 1012 Hz, as used for long-distance communication.

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the rate at which something occurs or is repeated over a particular period of time or in a given sample.
the rate at which a vibration occurs 2.that constitutes a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light), usually measured per second.

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WAVELENGTH 1. the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.      

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WAVELENGTH 1. the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.      

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2.a person's ideas and way of thinking, especially as it affects their ability to communicate with others.

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a wave vibrating in the direction of propagation.

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a wave vibrating at right angles to the direction of its propagation.

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Definition of electromagnetic wave. : one of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and that include radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

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A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, oscillating material does not move far from its initial equilibrium position.

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the women's section of the US Naval Reserve, established in 1942, or, since 1948, of the US Navy.

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1.coming after or as a result of.
2. of a wind or sea) blowing or moving in the same direction as the course of a vehicle or vessel.

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Definition of electromagnetic wave. : one of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and that include radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.