Usually means: Variant of the COVID-19 virus.
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We found 22 dictionaries that define the word omicron:

General (17 matching dictionaries)
  1. omicron: Merriam-Webster
  2. Omicron, omicron: Oxford Learner's Dictionaries
  3. omicron: American Heritage Dictionary of the English Language
  4. omicron: Collins English Dictionary
  5. omicron: Vocabulary.com
  6. Omicron, omicron: Wordnik
  7. omicron: Wiktionary
  8. omicron: Webster's New World College Dictionary, 4th Ed.
  9. omicron: The Wordsmyth English Dictionary-Thesaurus
  10. omicron: Infoplease Dictionary
  11. Omicron, omicron: Dictionary.com
  12. Omicron (disambiguation), Omicron (film), Omicron: Wikipedia, the Free Encyclopedia
  13. omicron: Rhymezone
  14. omicron: FreeDictionary.org
  15. omicron: Mnemonic Dictionary
  16. omicron: TheFreeDictionary.com
  17. omicron: Wikimedia Commons US English Pronunciations

Computing (1 matching dictionary)
  1. omicron: Dictionary of Algorithms and Data Structures

Medicine (2 matching dictionaries)
  1. Omicron: Merriam-Webster Medical Dictionary
  2. Omicron (letter), omicron: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. OMICRON: Acronym Finder

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

(Note: See omicrons as well.)

Definitions from Wiktionary (Omicron)

noun:  (sometimes capitalized) The 15th letter of the Classical and Modern Greek alphabets (16th in Ancient and Old Greek), used in ordering lists as in naming (astronomy) the 15th star of a constellation or (epidemiology) the 15th discovered major variant of a disease.
noun:  (virology, pathology) Ellipsis of Omicron variant. [(virology) The highly virulent B.1.1.529 strain of the SARS-CoV-2 virus that causes COVID-19.]
noun:  (virology, pathology, uncountable) Ellipsis of Omicron variant. [(virology) The highly virulent B.1.1.529 strain of the SARS-CoV-2 virus that causes COVID-19.]
noun:  (countable) Alternative form of omicron (Greek letter) (especially in the majuscule form) [(sometimes capitalized) The 15th letter of the Classical and Modern Greek alphabets (16th in Ancient and Old Greek), used in ordering lists as in naming (astronomy) the 15th star of a constellation or (epidemiology) the 15th discovered major variant of a disease.]
noun:  Ellipsis of Omicron Hill.; A mountain in North Slope borough, Alaska, United States

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