| RADIO | a communication system based on broadcasting electromagnetic waves |
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| RADIO | an electronic receiver that detects and demodulates and amplifies transmitted signals |
| RADIO | medium for communication |
| RADIO | transmit messages via radio waves |
| RADIO | (combining form) indicating radiation or radioactivity |
| RADIO | omnidirectional antenna comprising the part of a radio receiver by means of which radio signals are received |
| RADIO | an announcer whose voice is broadcast on radio |
| RADIO | omnidirectional antenna comprising the part of a radio receiver by means of which radio signals are received |
| RADIO | the branch of astronomy that detects and studies the radio waves emitted by celestial bodies |
| RADIO | a radio station that broadcasts a directional signal for navigational purposes |
| RADIO | a characteristic signal emitted by a transmitter used for navigation |
| RADIO | a signal transmitted along a narrow path |