n.
 (pl. radios)
   - the transmission and reception of radio waves, especially those carrying audio messages.
 - the activity of broadcasting sound to the public. 
▸a broadcasting station or channel.
 - an apparatus for receiving radio programmes. 
▸an apparatus capable of receiving and transmitting radio messages.
 
v.
 (radioes, radioing, radioed)
 send a message by radio. 
▸communicate with by radio.
 
  Etymology
  early 20th cent.: abbrev. of radio-telephone.