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O particle

  /oʊ/ , /əʊ/
  • The vocative particle, used for direct address.
ω

o noun

  /ˈoʊ/ , /ˈəʊ/
  • The name of the Latin-script letter O/o.
όου

-o-

-ο-
Wiktionary Links
  • English: O, o