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a person whose activities or beliefs are characterized by unionism. 2. a member of a trade union. 3. (initial capital letter) a supporter of the federal union of the United States of America, especially during the Civil War.
DEFINITION of 'Labor Union'. An organization intended to represent the collective interests of workers in negotiations with employers over wages, hours and working conditions. Labor unions are often industry-specific and tend to be more common in manufacturing, mining, construction, transportation and the public sector.