Usually means: Communication between amateur radio operators.
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We found 16 dictionaries that define the word QSO:

General (9 matching dictionaries)
  1. QSO, QSO: Merriam-Webster
  2. QSO: Oxford Learner's Dictionaries
  3. QSO: Collins English Dictionary
  4. QSO: Infoplease Dictionary
  5. QSO: Dictionary.com
  6. QSO: Wikipedia, the Free Encyclopedia
  7. QSO: Stammtisch Beau Fleuve Acronyms
  8. QSO: TheFreeDictionary.com
  9. QSO: Wiktionary

Computing (1 matching dictionary)
  1. QSO: Encyclopedia

Miscellaneous (2 matching dictionaries)
  1. QSO: Acronym Finder
  2. AbbreviationZ (No longer online)

Science (3 matching dictionaries)
  1. QSO: Eric Weisstein's World of Astronomy
  2. QSO: Extragalactic Astronomy
  3. QSO: Zoom Astronomy Glossary

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

Definitions from Wiktionary (QSO)

noun:  (dated) A radio-quiet quasar.
verb:  (ambitransitive, radio slang) To communicate (with) by means of amateur radio.
noun:  Initialism of quasi-stellar object. (a quasar) [(astronomy) a quasar]

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