Electromagnetic radiation with lower frequencies and longer wavelengths than those of microwaves, having frequencies lower than 300 megahertz and wavelengths longer than 1 meter, A device, such as a walkie-talkie, that transmits or receives such signals, An electronic device for listening to radio programming, consisting of a tuner and speakers, intransitive verb_ To transmit by radio, To transmit messages or a message by radio,

A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of very high frequency radio waves reflected from their surfaces, countable An installation of such a system or of the transmitting and receiving apparatus, measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects, verb_ To scan with radar, or as if with radar

Having the wavelength in the infrared, having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end, Having the wavelength in the infrared, noun_ Infrared light or the infrared part of the spectrum, electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation, having a wavelength between 700 nm and 1 mm

The branch of physics that deals with light and vision, chiefly the generation, propagation, and detection of electromagnetic radiation having wavelengths greater than x-rays and shorter than microwaves, physics The physics of light and vision, The light-related aspects of a device, figuratively Perception, image, public relations