adjective ra·dio \ˈrā-dē-ˌō\

Definition of RADIO

:  of, relating to, or operated by radiant energy
:  of or relating to electric currents or phenomena (as electromagnetic radiation) of frequencies between about 3000 hertz and 300 gigahertz
a :  of, relating to, or used in radio or a radio set
b :  specializing in radio or associated with the radio industry
c (1) :  transmitted by radio
(2) :  making or participating in radio broadcasts
d :  controlled or directed by radio

Origin of RADIO

2radio or radio-
First Known Use: 1887

Other Telecommunications Terms

Ethernet, intercept

Rhymes with RADIO

acid snow, afterglow, aikido, alpenglow, apropos, art deco, art nouveau, audio, Baguio, Bamako, barrio, bay window, Bergamo, bibelot, Bilbao, black widow, blow-by-blow, body blow, bone marrow, bordereau, Borneo, bow window, buffalo, Buffalo, bungalow, Bushido, buteo, calico, cameo, cachalot, cembalo, centimo, CEO, chassepot, cheerio, Clemenceau, cogito, comedo, comme il faut, counterflow, Cupid's bow, curaçao, Curaçao, curassow, curio, daimyo, danio, Delano, Diderot, do-si-do, domino, dynamo, embryo, entrepôt, Erato, escargot, Eskimo, extrados, fabliau, folio, French window, fricandeau, furbelow, gigolo, golden glow, go-no-go, grass widow, guacharo, hammer throw, hammertoe, haricot, heel-and-toe, hetero, high and low, HMO, Holy Joe, horror show, Idaho, in a row, indigo, in escrow, in the know, Jericho, kakapo, latigo, little toe, long-ago, Longfellow, Maceió, Maginot, Manchukuo, medico, Mexico, mistletoe, modulo, Monaco, Navajo, NCO, nuncio, oleo, olio, on tiptoe, Oreo, overflow, overgrow, overthrow, ovolo, Pamlico, Papago, paseo, picaro, piccolo, Pierrot, polio, pomelo, pompano, portico, PPO, Prospero, proximo, quid pro quo, raree-show, ratio, Richard Roe, Rochambeau, rococo, rodeo, Romeo, rose window, round window, saddlebow, Sapporo, sapsago, Scapa Flow, Scipio, Scorpio, semipro, show window, sloppy joe, so-and-so, SRO, standing O, status quo, stereo, stop-and-go, studio, subito, tallyho, tangelo, Taranto, tic-tac-toe, TKO, to-and-fro, Tokyo, tombolo, touch-and-go, tournedos, tremolo, tuckahoe, tupelo, UFO, ultimo, undergo, undertow, Veneto, vertigo, vibrio, video, virago, vireo, Zhangjiakou, zydeco



: the system or process that is used for sending and receiving signals through the air without using wires

: programs that are broadcast by radio

: a device that is used to receive the signals that are broadcast by radio

plural ra·di·os

Full Definition of RADIO

a :  the wireless transmission and reception of electric impulses or signals by means of electromagnetic waves
b :  the use of these waves for the wireless transmission of electric impulses into which sound is converted
:  a radio message
:  a radio receiving set
a :  a radio transmitting station
b :  a radio broadcasting organization
c :  the radio broadcasting industry
d :  communication by radio

Examples of RADIO

  1. The news was sent by radio.
  2. I listen to the radio all the time.
  3. I heard the news on the radio.
  4. There's a problem with the car's radio.
  5. The radio was playing very loudly.
  6. The pilot's radio wasn't working.

Origin of RADIO

short for radiotelegraphy
First Known Use: 1903

Other Telecommunications Terms

Ethernet, intercept



: to send a message to someone by radio

Full Definition of RADIO

transitive verb
:  to send or communicate by radio
:  to send a radio message to
intransitive verb
:  to send or communicate something by radio

Examples of RADIO

  1. The police radioed for backup.
  2. The stranded sailors were radioing for help.
  3. The pilot radioed in to the control tower.
  4. The police radioed a report back to the station.
  5. They radioed the Coast Guard for help.

First Known Use of RADIO


Other Telecommunications Terms

Ethernet, intercept


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