Usually means: Energy emitted and propagated through space.
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We found 65 dictionaries that define the word radiation:

General (26 matching dictionaries)
  1. radiation: Merriam-Webster.com
  2. radiation: Oxford Learner's Dictionaries
  3. radiation: American Heritage Dictionary of the English Language
  4. radiation: Collins English Dictionary
  5. radiation: Vocabulary.com
  6. Radiation, radiation: Wordnik
  7. radiation: Cambridge Advanced Learner's Dictionary
  8. radiation: Wiktionary
  9. radiation: Webster's New World College Dictionary, 4th Ed.
  10. radiation: The Wordsmyth English Dictionary-Thesaurus
  11. radiation: Infoplease Dictionary
  12. radiation: Dictionary.com
  13. radiation: Online Etymology Dictionary
  14. radiation: Cambridge Essential American English Dictionary
  15. Radiation (EP), Radiation (Marillion album), Radiation (album), Radiation (biology), Radiation (disambiguation), Radiation (evolution), Radiation (medicine), Radiation (pain), Radiation: Wikipedia, the Free Encyclopedia
  16. Radiation: Online Plain Text English Dictionary
  17. radiation: Webster's Revised Unabridged, 1913 Edition
  18. radiation: Rhymezone
  19. radiation: AllWords.com Multi-Lingual Dictionary
  20. radiation: Webster's 1828 Dictionary
  21. radiation: Free Dictionary
  22. radiation: Mnemonic Dictionary
  23. radiation: LookWAYup Translating Dictionary/Thesaurus
  24. radiation: Dictionary/thesaurus

Business (1 matching dictionary)
  1. BusinessDictionary.com (No longer online)

Computing (2 matching dictionaries)
  1. Radiation: Cybernetics and Systems
  2. radiation: Encyclopedia

Medicine (11 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Radiation: MedTerms.com Medical Dictionary
  3. Medical Dictionary (No longer online)
  4. Radiation: Merck Manuals
  5. online medical dictionary (No longer online)
  6. radiation: Prostate Cancer Interactive Glossary
  7. radiation: Dictionary of Cancer Terms
  8. radiation: Parents' Common Sense Encyclopedia
  9. radiation: Medical dictionary
  10. Radiation: Drug Medical Dictionary
  11. Hyperdictionary (No longer online)

Miscellaneous (1 matching dictionary)
  1. Encyclopedia of Graphic Symbols (No longer online)

Science (11 matching dictionaries)
  1. From Stargazers to Starships Glossary (No longer online)
  2. Environmental Terminology Discovery Service (No longer online)
  3. Radiation: Eric Weisstein's World of Physics
  4. Illustrated Glossary of Geologic Terms (No longer online)
  5. Imagine the Universe! Dictionary (No longer online)
  6. On-Line Biology Book: GLOSSARY (No longer online)
  7. Radiation: Extragalactic Astronomy
  8. Fishkeeping glossary (No longer online)
  9. radiation: UNCChem Glossary
  10. Accelerator Glossary (No longer online)
  11. radiation: Natural History Terms

Slang (1 matching dictionary)
  1. radiation: Urban Dictionary

Tech (12 matching dictionaries)
  1. radiation: Webster's New World Telecom Dictionary
  2. High-Energy Astrophysics (No longer online)
  3. AUTOMOTIVE TERMS (No longer online)
  4. Efficient Windows (No longer online)
  5. Glossary of Meteorology (No longer online)
  6. Glossary of Common Hearth and Heating Terms (No longer online)
  7. Explosives (No longer online)
  8. Radiation: Construction Glossary
  9. National Weather Service Glossary (No longer online)
  10. Glossary of Energy Terms (No longer online)
  11. RADIATION: Power Engineering
  12. Nuclear Terms (No longer online)

(Note: See radiational as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The shooting forth of anything from a point or surface, like diverging rays of light.
noun:  The process of radiating waves or particles.
noun:  The transfer of energy via radiation.
noun:  Radioactive energy.
noun:  (evolutionary theory, countable) A rapid diversification of an ancestral species into many new forms.

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