radio

adjective
ra·​dio | \ ˈrā-dē-ˌō How to pronounce radio (audio) \

Definition of radio

 (Entry 1 of 4)

1 : of, relating to, or operated by radiant energy
2 : of or relating to electric currents or phenomena (such as electromagnetic radiation) of frequencies between about 3000 hertz and 300 gigahertz
3a : 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

radio

noun
plural radios

Definition of radio (Entry 2 of 4)

1a : 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
2 : a radio message
3 : a radio receiving set
4a : a radio transmitting station
b : a radio broadcasting organization
c : the radio broadcasting industry
d : communication by radio

radio

verb
radioed; radioing; radios

Definition of radio (Entry 3 of 4)

transitive verb

1 : to send or communicate by radio
2 : to send a radio message to

intransitive verb

: to send or communicate something by radio

Definition of radio- (Entry 4 of 4)

— see radi-

Examples of radio in a Sentence

Noun

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

Verb

The police radioed for backup. The stranded sailors were radioing for help. The pilot radioed in to the control tower. The police radioed a report back to the station. They radioed the Coast Guard for help.
See More

Recent Examples on the Web: Noun

Reminiscing about color with one of my @housebeautiful covers back from 2004... Join me and @nturnerdesign on our @radioandysxm @siriusxm radio show #talkingchic 9amPT / 12pmET. Hadley Keller, House Beautiful, "3 Top Interior Designers Share the Rules They Always Break," 30 May 2019 Later, if a crash seems imminent, the seat receives a radio signal from the car that initiates the electronic release of that spring and cinches the child seat's belts tight. Alexander Stoklosa, Car and Driver, "Mercedes-Benz's Car Seat Prototype Will Make Children Safer," 21 May 2019 Alcatraz would also become the base of a groundbreaking radio program called Radio Free Alcatraz, hosted by Santee Sioux activist, speaker, and poet John Trudell. Ruth Hopkins, Teen Vogue, "How Alcatraz Island Was Reclaimed by Native Peoples," 7 Mar. 2019 The data was obtained by Reveal, the website, public radio program, podcast and social-media platform of The Center for Investigative Reporting, and the Associated Press. Monique O. Madan, miamiherald, "Here’s a national map of the shelters housing immigrant children," 29 June 2018 The hero, Georg (Franz Rogowski), a German refugee in France, is trying to repair a loose connection on a radio while a young boy looks on, transfixed. Joe Morgenstern, WSJ, "‘Transit’ Review: Exploring the State of Being a Stateless Man," 7 Mar. 2019 Analyst and radio host Zerlina Maxwell called into question whether Sanders was still considering leaving her post; in June 2018, a CBS News report claimed that Sanders was considering stepping down, but Sanders pushed back on Twitter. Lucy Diavolo, Teen Vogue, "Sarah Sanders Got Dragged for Tweeting About “Mueller Madness”," 26 Mar. 2019 After taking Dancing With the Stars by storm, country music radio host Bobby Bones is back. Kayla Keegan, Good Housekeeping, "What the 'American Idol' Judges Really Think About Bobby Bones Being a Mentor," 19 Feb. 2019 Payment processing giant PayPal has cut off the account of Alex Jones—the latest in a long line of technology companies to cut ties with the radio host and online provocateur. Timothy B. Lee, Ars Technica, "PayPal bans Alex Jones, saying he “promoted hate”," 21 Sep. 2018

Recent Examples on the Web: Verb

The Nissan was spotted minutes later on the Dan Ryan, then an officer radioes about a crash at 79th and LaFayette. Madeline Buckley, chicagotribune.com, "Minister drives by crash scene, not knowing wife died there: 'She was a beautiful, sweet, loving woman'," 11 May 2018 Frightened of retaliatory airstrikes, the militants withdrew quickly, radioing congratulations to each other, according to intelligence reports cited by Gov. Gooni and U.S. officials. Michael M. Phillips, WSJ, "America’s Other Endless War: Battling al-Shabaab in Somalia," 17 Jan. 2019 Sevareid played a central role in introducing Americans to radio news, at the time a new form of reporting. Marvin Kalb, WSJ, "Five Best: Marvin Kalb on Memoirs of War Reporting," 11 Jan. 2019 Then there’s the design, which employs a stem much like Apple’s AirPods — that should help keep an uninterrupted connection by pushing the wireless radios further away from the listener’s ear. Vlad Savov, The Verge, "RHA’s TrueConnect buds look like a promising AirPods rival," 4 Oct. 2018 The wranglers could radio to each other, but otherwise our communications would be limited to yelling across the plain. Ella Riley-adams, Vogue, "I Ditched My Phone for a Montana Cattle Drive (and Finally Dealt With My Feelings)," 3 Oct. 2018 Their mission is to blow up a key transmitter so German forces can’t radio in a warning about the big attack. Bryan Bishop, The Verge, "Overlord is a gloriously entertaining piece of B-movie schlock," 9 Nov. 2018 He and another staffer secured themselves in a safe building and radioed zoo staff. Kevin Mcgill, The Seattle Times, "Sharp teeth: Jaguar may have bitten through steel cable," 17 July 2018 Miles radioed to warn others of the discovery, likely saving hundreds of lives, but was never heard from again, his sister said. Julia Terruso, Philly.com, "After Trump-Kim summit, Philly-area family asking 'What about my brother' could finally get an answer," 20 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'radio.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of radio

Adjective

1887, in the meaning defined at sense 1

Noun

1903, in the meaning defined at sense 1a

Verb

1913, in the meaning defined at transitive sense 1

History and Etymology for radio

Noun and Adjective

short for radiotelegraphy

Keep scrolling for more

Learn More about radio

Statistics for radio

Look-up Popularity

Time Traveler for radio

The first known use of radio was in 1887

See more words from the same year

Keep scrolling for more

More Definitions for radio

radio

noun

English Language Learners Definition of radio

 (Entry 1 of 2)

: 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

radio

verb

English Language Learners Definition of radio (Entry 2 of 2)

: to send a message to someone by radio

radio

noun
ra·​dio | \ ˈrā-dē-ˌō How to pronounce radio (audio) \
plural radios

Kids Definition of radio

 (Entry 1 of 3)

1 : the process that is used for sending or receiving signals by means of electromagnetic waves without a connecting wire
2 : a device that receives signals sent by radio
3 : programs that are broadcast by radio
4 : a device used to both send and receive messages by radio
5 : the radio broadcasting industry

radio

adjective

Kids Definition of radio (Entry 2 of 3)

1 : of or relating to radio waves
2 : of, relating to, or used in radio broadcasting

radio

verb
radioed; radioing

Kids Definition of radio (Entry 3 of 3)

: to communicate or send a message to by radio

Keep scrolling for more

More from Merriam-Webster on radio

Rhyming Dictionary: Words that rhyme with radio

Spanish Central: Translation of radio

Nglish: Translation of radio for Spanish Speakers

Britannica English: Translation of radio for Arabic Speakers

Britannica.com: Encyclopedia article about radio

Comments on radio

What made you want to look up radio? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

standardized text or formulaic language

Get Word of the Day daily email!

Test Your Vocabulary

Finance Words Quiz

  • a-piggy-bank
  • The etymology of mortgage is related most closely to which two words?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!