a socialistic organization (1864–76) formed to unite and promote the interests of workers throughout the world.Compare international(def 6).
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for first international
an association of socialists and labour leaders founded in London in 1864 and dissolved in Philadelphia in 1876Official name: International Workingmen's Association
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