Radio Definition

rādē-ō
radioed, radioing, radios
noun
radios
Electromagnetic radiation with lower frequencies and longer wavelengths than those of microwaves, having frequencies lower than 300 megahertz and wavelengths longer than 1 meter.
American Heritage
The practice or science of communicating over a distance by converting sounds or signals into electromagnetic waves and transmitting these directly through space, without connecting wires, to a receiving set, which changes them back into sounds, signals, etc.
Webster's New World
Such a receiving set, esp. one adapted for receiving the waves of the assigned frequencies of certain transmitters or broadcasting stations.
Webster's New World
A device, such as a walkie-talkie, that transmits or receives such signals.
American Heritage
Broadcasting by radio as an industry, entertainment, art, etc.
Webster's New World
verb
radioed, radioing, radios
To transmit by radio.
Radio a message to headquarters.
American Heritage
To send (a message, etc.) or communicate with (a person) by radio.
Webster's New World
To transmit messages or a message by radio.
A ship radioing for help.
American Heritage
To order or assist (to a location), using telecommunications.
Wiktionary
prefix
Radiation; radiant energy.
Radiometer.
American Heritage
Radioactive.
Radiochemistry.
American Heritage
Radio.
Radiotelephone.
American Heritage
adjective
Of, using, used in, sent by, or operated by radio.
Webster's New World
Having to do with electromagnetic wave frequencies between c. 10 kilohertz and c. 300,000 megahertz.
Webster's New World
Synonyms:
  • telephonic
  • telecommunicational
  • radiotelegraphic
affix
Ray, raylike.
Webster's New World
By radio.
Radiotelegraph.
Webster's New World
By means of radiant energy.
Radiothermy.
Webster's New World
Radioactive.
Radiotherapy.
Webster's New World

Other Word Forms of Radio

Noun

Singular:
radio
Plural:
radios

Origin of Radio

  • Fr < L radius, ray: see radius

    From Webster's New World College Dictionary, 5th Edition

  • From Latin radius (“ray").

    From Wiktionary

  • Short for radiotelegraphy

    From American Heritage Dictionary of the English Language, 5th Edition

  • From radiation

    From American Heritage Dictionary of the English Language, 5th Edition

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