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labor union labor unions plural a labor union is an organization that represents the rights and interests of workers to their employers for example in order to improve working conditions or wages am n count in brit use trade union
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  labor, labour, working class, proletariat(noun) a social class comprising those who do manual labor or work for wages. there is a shortage of skilled labor in this field.