I. ˈrādēˌō sometimes especially formerly ˈrad- noun
( -s )
Etymology: short for radiotelegraphy
1.
a. : the transmission and reception of electric impulses or signals by means of electromagnetic waves without a connecting wire
radio includes wireless, television, and radar
b. : the use of these waves for the wireless transmission of electromagnetic impulses into which sound is converted — often distinguished from television
2. : a radio message : radiogram
3. : a radio receiving set
4.
a. : a radio sending station
b. : a radio broadcasting organization
a national radio
c. : the radio broadcasting industry
became the youngest announcer in radio — Current Biography
d. : radio as a medium of communication
jurisdiction over press, radio , and film — Current Biography
II. adjective
1. : of, relating to, employing, or operated by radiant energy especially of electromagnetic waves : relating to or employed in radiotelegraphy or radiotelephony or other applications of radio waves
radio communication
2. : of or relating to electric currents or phenomena of frequencies between about 15,000 and (10) 11 per second
3.
a. : of, relating to, or used in radio or a radio set
radio transformer
radio dial
b. : specializing in radio or employed in or associated with the radio industry
radio engineer
c.
(1) : transmitted by radio
radio message
radio concert
(2) : making or participating in radio broadcasts
radio announcer
radio commentator
radio entertainers
d. : controlled or directed by radio
III. verb
( -ed/-ing/-s )
transitive verb
1. : to send or communicate by radio
the sound … is radioed back automatically to the ship — Erwin Raisz
2. : to send a radio message to
intransitive verb
: to send or communicate by radio