Meaning of “radio” in the English Dictionary

"radio" in English

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uk /ˈreɪ.di.əʊ/ us /ˈreɪ.di.oʊ/ plural radios

A1 [ C ] a piece of electronic equipment used for listening to radio broadcasts:

a car radio
I switched on the radio.

A1 [ S or U ] the programmes that you hear when you listen to the radio:

I heard a good programme on the radio last night.
I don't listen to radio much.

B1 [ U ] the system or work of broadcasting sound programmes for the public to listen to:

a local radio station
She's got some kind of job in radio.

[ C or U ] a piece of electronic equipment that can send and receive spoken messages or signals, or the messages or signals that are sent or received:

We sent a message over the radio/by radio.
The children got radio-controlled toy cars for Christmas.

More examples

radioverb [ I or T ]

uk /ˈreɪ.di.əʊ/ us /ˈreɪ.di.oʊ/

(Definition of “radio” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"radio" in American English

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radionoun [ C/U ]

us /ˈreɪ·diˌoʊ/ plural radios

a device for receiving, and sometimes broadcasting, sound messages, or the receiving or sending of sound messages:

[ C ] I listen to the radio in the morning to get the weather report.

Radio is also the work of broadcasting sound programs for the public to listen to.

physics Radio waves are the energy waves of a certain length that are used in radio broadcasts.

radioverb [ I/T ]

us /ˈreɪ·diˌoʊ/ present participle radioing, past tense and past participle radioed

to send a message to someone by radio:

[ I/T ] They radioed (their base) for help.

(Definition of “radio” from the Cambridge Academic Content Dictionary © Cambridge University Press)