Dictionary Meaning and Definition on 'Radio'
adj : indicating radiation or radioactivity; "radiochemistry"
- medium for communication [syn: radiocommunication, wireless]
- an electronic receiver that detects and demodulates and amplifies transmitted signals [syn: radio receiver, receiving set, radio set, tuner, wireless]
- a communication system based on broadcasting electromagnetic waves [syn: wireless] v : transmit messages via radio waves; "he radioed for help"
- Radio \Ra"di*o\, a.
Of or pertaining to, or employing, or operated by, radiant
energy, specifically that of electric waves; hence,
pertaining to, or employed in, radiotelegraphy.
"Radio-" web1913 "Webster's Revised Unabridged Dictionary (1913)"
A combining form indicating connection with, or relation to,
a radius or ray; specifically (Anat.), with the radius of the
forearm; as, radio-ulnar, radiomuscular, radiocarpal.
Wikipedia Meaning and Definition on 'Radio'
Radio is the transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information is carried by systematically changing (modulating) some property of the radiated waves, such as amplitude, frequency, phase, or pulse width. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.
The etymology of "radio" or "radiotelegraphy" reveals that it was called "wireless telegraphy", which was shortened to "wireless" in Britain. The prefix radio- in the sense of wireless transmission, was first recorded in the word radioconductor, a description provided by the French physicist Édouard Branly in 1897. It is based on the verb to radiate (in Latin "radius" means "spoke of a wheel, beam of light, ray"). This word also appears in a 1907 article by Lee De Forest, it was adopted by the United States Navy in 1912, and became common by the time of the first commercial broadcasts in the United States in the 1920s. (The noun "broadcasting" itself came from an agricultural term, meaning "scattering seeds widely".) The term was then adopted by other languages in Europe and Asia. British Commonwealth countries continued to mainly use the term "wireless" until the mid-20th century, though the magazine of the BBC in the UK has been called Radio Times ever since it was first published in the early 1920s.[See more about Radio at Dictionary 3.0 Encyclopedia]
Words and phrases related to 'Radio'
'Radio' in famous quotation sentence
* You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this And radio operates exactly the same way you send signals here, they receive them there. The only difference is that there is no cat. - Albert Einstein
* If it weren't for Philo T. Farnsworth, inventor of television, we'd still be eating frozen radio dinners. - Johnny Carson
Click here for more related quotations on 'Radio'