Definitions for vertical union
Random House Webster's College Dictionary
a labor union composed of workers in various trades and crafts within one industry.
Origin of vertical union:
industrial union, vertical union(noun)
a labor union that admits all workers in a given industry irrespective of their craft
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"vertical union." Definitions.net. STANDS4 LLC, 2013. Web. 20 Jun 2013. <http://www.definitions.net/definition/vertical union>.