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C.I.O.

or CIO

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  1. chief investment officer.
  2. Congress of Industrial Organizations.
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Congress of Industrial Organizations

noun
  1. a federation of affiliated industrial labor unions, founded 1935 within the American Federation of Labor but independent of it 1938–55. Abbreviation: C.I.O., CIO
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for cio

CIO

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

noun
  1. (in the US) a federation of industrial unions formed in 1935. It united with the AFL in 1955 to form the AFL-CIOAbbreviation: CIO
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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