1
: of, relating to, or operated by radiant energy
2
: of or relating to electric currents or phenomena (such 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
plural radios
1
a
: the wireless transmission and reception of electric impulses or signals by means of electromagnetic waves
b
: 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
4
a
: a radio transmitting station
b
: a radio broadcasting organization
c
: the radio broadcasting industry
d
: communication by radio
radioed; radioing; radios
: to send or communicate something by radio
see radi-
Cite this Entry
“Radio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radio. Accessed 7 Jul. 2026.
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