Usually means: Temporary, fleeting existence or object.
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We found 21 dictionaries that define the word ephemeron:

General (19 matching dictionaries)
  1. ephemeron: Merriam-Webster.com
  2. ephemeron: Oxford Learner's Dictionaries
  3. ephemeron: American Heritage Dictionary of the English Language
  4. ephemeron: Collins English Dictionary
  5. ephemeron: Vocabulary.com
  6. ephemeron: Wordnik
  7. ephemeron: Wiktionary
  8. ephemeron: Webster's New World College Dictionary, 4th Ed.
  9. ephemeron: Infoplease Dictionary
  10. Ephemeron, ephemeron: Dictionary.com
  11. Ephemeron: Wikipedia, the Free Encyclopedia
  12. Ephemeron: Online Plain Text English Dictionary
  13. ephemeron: Webster's Revised Unabridged, 1913 Edition
  14. ephemeron: Rhymezone
  15. Ephemeron: AllWords.com Multi-Lingual Dictionary
  16. ephemeron: Free Dictionary
  17. ephemeron: The Phrontistery - A Dictionary of Obscure Words
  18. ephemeron: Mnemonic Dictionary
  19. ephemeron: Dictionary/thesaurus

Computing (1 matching dictionary)
  1. ephemeron: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

(Note: See ephemerons as well.)

Definitions from Wiktionary (ephemeron)

noun:  Something short-lived or transitory.
noun:  (programming) A type of weak reference in a garbage collected programming language that does not permit an object to be kept alive by its finalizer.

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