Radio is a way of transmitting sound using electromagnetic waves called radio waves. Nowadays, people usually only listen to the radio as they drive, but — before television — radio provided prime-time entertainment.

When you turn on your car radio, you probably take for granted the many choices of music and talk stations you can choose from. The radio's electronic components do the amazing job of catching fast-moving radio waves in the air and translating them into sounds you can hear. Radios were originally called wireless because they transmit energy using waves instead of wires. The Latin root of radio is radius, "beam."

Definitions of radio

n medium for communication

radiocommunication, wireless
Type of:
taking part in a radio or tv program

n an electronic receiver that detects and demodulates and amplifies transmitted signals

radio receiver, radio set, receiving set, tuner, wireless
show 4 types...
hide 4 types...
clock radio
a radio that includes a clock that can be set to turn it on automatically
crystal set
an early radio receiver using a crystal detector
heterodyne receiver, superhet, superheterodyne receiver
a radio receiver that combines a locally generated frequency with the carrier frequency to produce a supersonic signal that is demodulated and amplified
push-button radio
a radio receiver that can be tuned by pressing buttons
Type of:
receiver, receiving system
set that receives radio or tv signals

n a communication system based on broadcasting electromagnetic waves

radiotelegraph, radiotelegraphy, wireless telegraph, wireless telegraphy
the use of radio to send telegraphic messages (usually by Morse code)
Type of:
communication system
a system for communicating

v transmit messages via radio waves

“he radioed for help”
Type of:
communicate, intercommunicate
transmit thoughts or feelings

adj indicating radiation or radioactivity

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, can put you on the path to systematic vocabulary improvement.