Breadcrumb Home > Thesaurus > C Synonyms of cio Find synonyms for: Noun 1. Congress of Industrial Organizations, CIO, federation usage: a federation of North American industrial unions that merged with the American Federation of Labor in 1955 WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of cio (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: shanghai Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language