radio Definition in the Cambridge English Dictionary
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Definition of “radio” - English Dictionary

Definition of "radio" - American English Dictionary

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radionoun [C/U]

 us   /ˈreɪ·diˌoʊ/ (plural radios)
a ​device for ​receiving, and sometimes ​broadcasting, ​soundmessages, or the ​receiving or ​sending of ​soundmessages: [C] I ​listen to the radio in the ​morning to get the ​weatherreport. Radio is also the ​work of ​broadcastingsoundprograms for the ​public to ​listen to. physics Radio waves are the ​energywaves of a ​certainlength 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 (​theirbase) for ​help.
(Definition of radio from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "radio" - British English Dictionary

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radionoun

uk   /ˈreɪ.di.əʊ/  us   /-oʊ/ (plural radios)
A1 [C] a ​piece of ​electronicequipment 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 ​broadcastingsoundprogrammes 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 ​electronicequipment that can ​send and ​receivespokenmessages 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-controlledtoycars for ​Christmas.
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radioverb [I or T]

uk   /ˈreɪ.di.əʊ/  us   /-oʊ/
to ​send a ​message to someone by radio: We'll have to radio for more ​supplies. They radioed ​theirbase for ​help.
(Definition of radio from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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