radio · noun /ˈreɪd.iːˌoʊ/Full view
radio (EQUIPMENT)
A1 C a piece of equipment used for listening to sound broadcasts
Dictionary examples:

a car radio

Could you turn the radio on?

Learner example:

I want to sell my radio. (Key English Test; A2; Italian)

the radio
A1 the programs that you hear when you listen to the radio
Dictionary examples:

We heard him talking on the radio this morning.

I listen to the radio in the morning.

Learner example:

He likes watching television and listening [to the] radio. (Skills for Life (Entry 1); A1; Polish)

radio (SYSTEM)
B1 U a system of sending and receiving sound through the air
Dictionary examples:

local radio

a radio station

Learner example:

I'm thinking [of] call[ing] the radio station to inform [them about] my situation. (Preliminary English Test; B1; Portuguese)

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