An organized combination among workmen for the purpose of maintaining their rights, privileges, and interests with respect to wages, hours of labor, customs, etc.
Organised association of workmen formed for their protection and promotion of common interests.
an organization of workers who do similar jobs. A trade union exists to take collective action on behalf of its members in negotiations with employers over wages, working conditions, etc. Trade unions are usually composed of skilled or semiskilled workers who have learned a craft.