[ yoon-yuh-niz-uhm ]

  1. the principle of union, especially trade unionism.

  2. attachment to a union.

  1. (initial capital letter) loyalty to the federal union of the United States of America, especially at the time of the Civil War.

Origin of unionism

First recorded in 1835–45; union + -ism

Other words from unionism

  • pro·un·ion·ism, noun

Words Nearby unionism

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use unionism in a sentence

  • Land-reform in its earliest stages, like trade unionism in England, was accompanied by disorder.

    Ireland and Poland | Thomas William Rolleston
  • I have watched the long struggle of unionism in America and I know the law that has governed all its ups and downs.

    The Iron Puddler | James J. Davis
  • These are the principles of revolutionary unionism, the principles of the international proletariat.

    Communism and Christianism | William Montgomery Brown
  • Of this slavery does revolutionary unionism speak in the name of the revolutionary worker.

    Communism and Christianism | William Montgomery Brown

British Dictionary definitions for unionism (1 of 2)


/ (ˈjuːnjəˌnɪzəm) /

  1. the principles of trade unions

  2. adherence to the principles of trade unions

  1. the principle or theory of any union

British Dictionary definitions for Unionism (2 of 2)


/ (ˈjuːnjəˌnɪzəm) /

  1. (sometimes not capital) the principles or adherence to the principles of Unionists

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