# radio

Pronunciation: say "RAY-dee-oh" US /ˈɹeɪdiˌoʊ/, UK /ˈɹeɪdiˌəʊ/

## Noun

1. The technology for sending sound or other signals by modulating electromagnetic waves.
   - Simple: A way of sending sounds and signals through the air using invisible waves.
   - _Radio made it possible to reach ships far out at sea._
   - _The invention of radio changed how news traveled across continents._
2. A device that receives broadcast radio signals and plays them as sound. It is often combined with other audio functions, such as a CD player in a car.
   - Simple: A machine that picks up radio programs and plays them so you can hear them, like the one in a car.
   - _He adjusted the antenna so the radio could pick up distant stations._
   - _During the blackout, we listened to the news on a battery-powered radio._
3. A device used to send out signals over radio waves to distant receivers.
   - Simple: A machine that sends out signals over radio waves to other receivers.
   - _The team installed a powerful radio on the hilltop to reach distant stations._
   - _Field operators used a portable radio to transmit their coordinates._
4. The continuous streaming of sound over the Internet, in the manner of traditional radio.
   - Simple: Nonstop sound broadcasts sent over the Internet, like a normal radio station.
   - _Online radio lets listeners tune into stations from anywhere in the world._
   - _The station moved entirely to internet radio after closing its broadcast tower._
5. The broadcasting of programs over the airwaves, viewed as a means of communication or as an industry.
   - Simple: The sending out of shows by radio, seen as a kind of media or a business.
   - _Before television arrived, radio was where families gathered for news and comedy._
   - _Advertisers who once relied on radio have moved much of their spending online._

## Verb

6. To send a message to a person or station by radio, for example to report information or call for help or a vehicle.
   - Simple: To talk to someone or send a message using a radio, for example to ask for help.
   - _Pilots radio their position to air traffic control before landing._
   - _She had to radio the message twice before anyone answered._

## Origin

"Radio" is a shortened form of "radiotelegraphy."

Source: DictionaryAI, https://dictionaryai.com/define/radio (written from Wiktionary data, CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/).