or C.I.O.

  1. Business.chief information officer: an executive in an organization who oversees policies and decisions relating to information technology and computer systems.

  2. Business.chief investment officer: an executive in an organization who oversees financial assets.

Words Nearby CIO Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use CIO in a sentence

  • “Just like CIO-CIO-San,” he muttered to himself, as he dipped his hands into icy water for a morning splash.

    Panther Eye | Roy J. Snell
  • Had it been stolen from her, or was this strange interpreter, who had doubtless just now saved his life, CIO-CIO-San 158 herself?

    Panther Eye | Roy J. Snell
  • Montgomery admitted that he blamed the CIO-root for his sufferings.

  • All respectable chemists, Montgomery assures me, keep the CIO-root.

  • The Italians say: 'Le avversità sono per l'animo CIO ch' è un temporale per l'aria.'

    Willis the Pilot | Johanna Spyri

British Dictionary definitions for CIO


/ US /

abbreviation for
  1. Congress of Industrial Organizations: See also AFL-CIO

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012