GNU Collaborative International Dictionary of English

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Found 2 definitions 

  1.       
O'. [Ir. o a descendant.] A prefix to Irish family names, which signifies grandson or descendant of, and is a character of dignity; as, “O'Neil, O'Carrol”.

    [1913 Webster]

    
      
    
  2.       
O' (ō; unaccented ṓ), prep. A shortened form of of or on. “At the turning o' the tide.”  Shak.

    [1913 Webster]

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