WordNet (r) 3.0 (2006):

CIO
    n 1: a federation of North American industrial unions that
         merged with the American Federation of Labor in 1955 [syn:
         Congress of Industrial Organizations, CIO]

The Free On-line Dictionary of Computing (19 January 2023):

Chief Information Officer
CIO
MIS Director

    (CIO) The person who determines the overall strategic
   direction and business contribution of the information
   systems function in a business.

   (2004-03-18)