Usually means: Transmission of sound via waves.
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We found 50 dictionaries that define the word radio:

General (27 matching dictionaries)
  1. radio, radio-: Merriam-Webster.com
  2. radio, radio-: Oxford Learner's Dictionaries
  3. radio, radio-: American Heritage Dictionary of the English Language
  4. radio, radio-: Collins English Dictionary
  5. radio: Vocabulary.com
  6. Radio, radio, radio-: Wordnik
  7. radio: Cambridge Advanced Learner's Dictionary
  8. radio, radio-: Wiktionary
  9. radio, radio-: Webster's New World College Dictionary, 4th Ed.
  10. radio, radio (radi-): The Wordsmyth English Dictionary-Thesaurus
  11. radio: Infoplease Dictionary
  12. Radio-, radio, radio-: Dictionary.com
  13. radio: Online Etymology Dictionary
  14. radio: Cambridge Essential American English Dictionary
  15. RADIO, Radio (Alesha Dixon song), Radio (Darius Rucker song), Radio (Ky-Mani Marley album), Radio (LL Cool J album), Radio (Michael Rother album), Radio (Naked City album), Radio (Rammstein song), Radio (Robbie Williams song), Radio (Steep Canyon Rangers album), Radio (The Corrs song), Radio (Wise Guys), Radio (Wise Guys album), Radio (disambiguation), Radio (film), Radio (magazine), Radio (movie), Radio, The Radio(album), The Radio (Vince Gill song), The Radio: Wikipedia, the Free Encyclopedia
  16. Radio-: Online Plain Text English Dictionary
  17. radio-: Webster's Revised Unabridged, 1913 Edition
  18. radio: Rhymezone
  19. Radio-, Radio (nt), radio, radio, radio, radio (de), radio (f): AllWords.com Multi-Lingual Dictionary
  20. radio, radio-: Free Dictionary
  21. radio: Mnemonic Dictionary
  22. Radio: The Word Detective
  23. radio, radio, radio-: Dictionary/thesaurus
  24. radio: Wikimedia Commons US English Pronunciations
  25. radio, radio-: MyWord.info

Art (1 matching dictionary)
  1. radio-: A Cross Reference of Latin and Greek Elements

Business (1 matching dictionary)
  1. radio: Legal dictionary

Computing (3 matching dictionaries)
  1. Radio, radio: CCI Computer
  2. I T Glossary (No longer online)
  3. radio, radio-: Encyclopedia

Medicine (3 matching dictionaries)
  1. Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. radio, radio-: Medical dictionary

Miscellaneous (4 matching dictionaries)
  1. Encyclopedia of Graphic Symbols (No longer online)
  2. RADIO: Acronym Finder
  3. Brilliant Dream Dictionary (No longer online)
  4. Army Technology Glossary (No longer online)

Science (4 matching dictionaries)
  1. Environmental Terminology Discovery Service (No longer online)
  2. Imagine the Universe! Dictionary (No longer online)
  3. Radio: Extragalactic Astronomy
  4. radio: WebElements Periodic Table of the Elements

Slang (1 matching dictionary)
  1. radio, radio: Green’s Dictionary of Slang

Tech (6 matching dictionaries)
  1. radio: Webster's New World Telecom Dictionary
  2. High-Energy Astrophysics (No longer online)
  3. Explosives (No longer online)
  4. SeaTalk Dictionary of English Nautical Language (No longer online)
  5. Radio: Latitude Mexico
  6. AUTOMOTIVE TERMS (No longer online)

(Note: See radioed as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (uncountable) The technology that allows for the transmission of sound or other signals by modulation of electromagnetic waves.
noun:  (countable) A device that can capture (receive) the signal sent over radio waves and render the modulated signal as sound.
noun:  (countable) An on-board entertainment system in a car, usually including a radio receiver as well as the capability to play audio from recorded media; see also car radio.
noun:  (countable) A device that can transmit radio signals.
noun:  (Internet, uncountable) The continuous broadcasting of sound via the Internet in the style of traditional radio.
verb:  (transitive, intransitive) To use two-way radio to transmit (a message) (to another radio or other radio operator).
verb:  (transitive) To order or assist (to a location), using telecommunications.

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