1. an abbreviated form of of, as in o’clock or will-o’-the-wisp.
  2. an abbreviated form of on.

  1. a prefix meaning “descendant,” in Irish family names: O’Brien; O’Connor.


  1. informal, or archaic shortened form of of a cup o’ tea

as a prefix in Irish names, from Irish ó, ua (Old Irish au) “descendant.”

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