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Definition of “radio” - Learner’s Dictionary

radio

noun     /ˈreɪdiəʊ/
BROADCASTS [C]
A1 a piece of equipment used for listening to radio broadcasts: a car radioRadio
the radio
A1 the programmes that you hear when you listen to the radio: We heard him speaking on the radio this morning. I listen to the radio in the evening.Radio
SYSTEM [U]
B1 a system of sending and receiving sound through the air: local radio a radio station Radio
MESSAGES [C]
a piece of equipment for sending and receiving messages by soundRadio
(Definition of radio noun from the Cambridge Learners Dictionary © Cambridge University Press)
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