Webster's English Dictionary

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radio

1. ra.dio \'ra-d-e--.o-\ n [short for radiotelegraphy] 1a: the wireless 
   transmission and reception of electric impulses or signals  by means of 
   electric waves 1b: the use of these waves for the wireless transmission of  
   electric impulses into which sound is converted 2: a radio message  3: a 
   radio receiving set  4a: a radio transmitting station  4b: a radio 
   broadcasting organization  4c: the radio broadcasting industry  4d: 
   communication by radio 
2. radio aj 1: of, relating to, or operated by radiant energy  2: of or 
   relating to electric currents or phenomena of frequencies between  about 
   15000 and (10)11 per second 3a: of, relating to, or used in radio or a 
   radio set  3b: specializing in radio or associated with the radio industry  
   3c1: transmitted by radio  3c2: making or participating in radio broadcasts 
    3d: controlled or directed by radio 
3. radio vt 1: to send or communicate by radio  2: to send a radio message 
   to  : to send or communicate something by radio