Usually means: Distinct period in historical time.
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We found 50 dictionaries that define the word epoch:

General (27 matching dictionaries)
  1. epoch: Merriam-Webster
  2. epoch: Oxford Learner's Dictionaries
  3. epoch: American Heritage Dictionary of the English Language
  4. epoch: Collins English Dictionary
  5. epoch: Vocabulary.com
  6. Epoch, epoch: Wordnik
  7. epoch: Cambridge Advanced Learner's Dictionary
  8. epoch: Wiktionary
  9. epoch: Webster's New World College Dictionary, 4th Ed.
  10. epoch: The Wordsmyth English Dictionary-Thesaurus
  11. epoch: Infoplease Dictionary
  12. epoch: Dictionary.com
  13. epoch: Online Etymology Dictionary
  14. epoch: Cambridge Essential American English Dictionary
  15. EPOCH (chemotherapy), Epoch (American magazine), Epoch (DC Comics), Epoch (Marvel Comics), Epoch (Russian magazine), Epoch (Top Cow), Epoch (Tycho album), Epoch (anthology), Epoch (astronomy), Epoch (comics), Epoch (company), Epoch (computing), Epoch (cosmology), Epoch (date reference), Epoch (disambiguation), Epoch (film), Epoch (geology), Epoch (reference date), Epoch (song), Epoch (timekeeping), Epoch (video game), Epoch: Wikipedia, the Free Encyclopedia
  16. Epoch: Online Plain Text English Dictionary
  17. epoch: Webster's Revised Unabridged, 1913 Edition
  18. epoch: Rhymezone
  19. Epoch: AllWords.com Multi-Lingual Dictionary
  20. epoch: Webster's 1828 Dictionary
  21. epoch: FreeDictionary.org
  22. epoch: Mnemonic Dictionary
  23. epoch: TheFreeDictionary.com
  24. epoch: Wikimedia Commons US English Pronunciations
  25. epoch: Longman Dictionary of Contemporary English

Art (1 matching dictionary)
  1. epoch: Dictionary of Philosophical Terms and Names

Business (1 matching dictionary)
  1. Epoch (timekeeping), epoch: Legal dictionary

Computing (4 matching dictionaries)
  1. epoch: Free On-line Dictionary of Computing
  2. epoch: CCI Computer
  3. epoch: Computer Telephony & Electronics Dictionary and Glossary
  4. Epoch (geology), Epoch (timekeeping), epoch: Encyclopedia

Medicine (3 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. EPOCH: Dictionary of Cancer Terms
  3. Sleep Terms (No longer online)

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

Science (10 matching dictionaries)
  1. Epoch: Eric Weisstein's World of Astronomy
  2. Illustrated Glossary of Geologic Terms (No longer online)
  3. On-Line Biology Book: GLOSSARY (No longer online)
  4. Epoch: Extragalactic Astronomy
  5. EPOCH: A Dictionary of Quaternary Acronyms and Abbreviations
  6. Anthropology dictionary (No longer online)
  7. Geography Dictionary (No longer online)
  8. How Many? A Dictionary of Units of Measurement (No longer online)
  9. EPOCH: Zoom Astronomy Glossary
  10. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

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

Tech (1 matching dictionary)
  1. Glossary of Meteorology (No longer online)

(Note: See epochs as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A particular period of history, or of a person's life, especially one considered noteworthy or remarkable.
noun:  A notable event which marks the beginning of such a period.
noun:  (chronology, astronomy, computing) A specific instant in time, chosen as the point of reference or zero value of a system that involves identifying instants of time.
noun:  (geology) A geochronologic unit of hundreds of thousands to millions of years; a subdivision of a period, and subdivided into ages (or sometimes subepochs).
noun:  (machine learning) One complete presentation of the training data set to an iterative machine learning algorithm.
verb:  (sciences, transitive) To divide (data) into segments by time period.
noun:  (medicine) An intensive chemotherapy regimen for treating aggressive non-Hodgkin lymphoma, consisting of etoposide, prednisolone, Oncovin (vincristine), cyclophosphamide, and hydroxydaunorubicin.

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