Main Entry: ¹ra·dio

Pronunciation: \ˈrā-dē-ˌō\

Function: adjective

Etymology: ²radio or radio-

Date: 1887

1 : of, relating to, or operated by radiant energy
2 : of or relating to electric currents or phenomena (as electromagnetic radiation) of frequencies between about 3000 hertz and 300 gigahertz
3 a : of, relating to, or used in radio or a radio set b : specializing in radio or associated with the radio industry c (1) : transmitted by radio (2) : making or participating in radio broadcasts d : controlled or directed by radio