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See more synonyms for unionize on Thesaurus.com
verb (used with object), un·ion·ized, un·ion·iz·ing.
  1. to form into a union.
  2. to organize into a labor union; bring into or incorporate in a labor union.
  3. to subject to the rules of a labor union.
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verb (used without object), un·ion·ized, un·ion·iz·ing.
  1. to form a union.
  2. to join in a labor union.
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Also especially British, un·ion·ise.

Origin of unionize

First recorded in 1835–45; union + -ize
Related formsun·ion·i·za·tion, nounun·ion·iz·er, nouno·ver·un·ion·ize, verb, o·ver·un·ion·ized, o·ver·un·ion·iz·ing.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for unionization

unification, unionization, alliance, federation, merger, consolidation, affiliation, establishment, confederation, amalgamation, fraternization

Examples from the Web for unionization

Contemporary Examples of unionization

Historical Examples of unionization

  • Did Mr. Kane promise to grant every demand, except only unionization?


    Clement Wood

  • The company had refused to accede to the demands for unionization, even with a waiver of all other claims.


    Clement Wood

  • They agree to consider every one of our demands, provided only we don't insist on the demand for unionization.


    Clement Wood

  • It was a lost opportunity that unquestionably cost the unionization of the steel industry.

  • These locals, therefore, have been a great obstacle to the unionization of Negroes.

British Dictionary definitions for unionization



  1. to organize (workers) into a trade union
  2. to join or cause to join a trade union
  3. (tr) to subject to the rules or codes of a trade union
  4. to join or become joined in marriage or civil partnership
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Derived Formsunionization or unionisation, noun
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

Word Origin and History for unionization



"make into a union," 1841, from union + -ize. Related: Unionized; unionizing.

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Online Etymology Dictionary, © 2010 Douglas Harper