radio is simple a band of frequencies from 03 Khz or 30 Khz to 300 Ghz that is used for communication of voice,data etc. in form of wireless.
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Amplitude Modulation
radio frequency
radio jockey
radio broadcaster
RAdio Detection And Ranging
all india radio..
Frequency Modulation
citizens' band radio
Non-Directional Radio
Radio network controller
citizens' band radio
Radio has no definite epansion. It just denotes radiology or radiotelegraphy