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Longman Dictionary of Contemporary English
working class
noun
EXAMPLES FROM CORPUS
Working class, a socialist through thick and thin, and us.
▪ Firstly the increasing use of machinery will result in a homogeneous working class.
▪ Humphrey calls the differentiation of the working class thesis technologically determinist because he says it attaches too much importance to technology.
▪ It would be wrong to see this development as involving the replacement of the working class by the new urban left.
▪ On the one hand, they did not want working class hooligans swarming all over the country causing mayhem.
▪ The black population, thus, effectively constitutes an underclass, placed in a structurally different location from the white working class.
▪ This in itself would hardly have been significant had it not been for a wider transformation of the adult male working class.
The Collaborative International Dictionary
Working class

Working \Work"ing\, a & n. from Work.

The word must cousin be to the working.
--Chaucer.

Working beam. See Beam, n. 10.

Working class, the class of people who are engaged in manual labor, or are dependent upon it for support; laborers; operatives; -- chiefly used in the plural.

Working day. See under Day, n.

Working drawing, a drawing, as of the whole or part of a structure, machine, etc., made to a scale, and intended to be followed by the workmen. Working drawings are either general or detail drawings.

Working house, a house where work is performed; a workhouse.

Working point (Mach.), that part of a machine at which the effect required; the point where the useful work is done.

Wiktionary
working class

a. (alternative spelling of working-class English) n. The social class of those who perform physical work for a living, as opposed to the professional or middle class, the upper class, or others.

WordNet
working class

n. a social class comprising those who do manual labor or work for wages; "there is a shortage of skilled labor in this field" [syn: labor, labour, proletariat]

Wikipedia
Working Class (TV series)

Working Class is an American television sitcom created by Jill Cargerman, which premiered on CMT on January 28, 2011. The network ordered twelve episodes for the comedy, which is the first scripted series for the network.

On April 11, 2011, CMT cancelled Working Class after only one season due to low ratings.

Working class

The working class (also labouring class and proletariat) is the people employed for wages, especially in manual-labour occupations and in skilled, industrial work. Working-class occupations include blue-collar jobs, some white-collar jobs, and most service-work jobs. The working class only rely upon their earnings from wage labour, thereby, the category includes most of the working population of industrialized economies, of the urban areas (cities, towns, villages) of non-industrialized economies, and of the rural workforce.

In Marxist theory and in socialist literature, the term working class usually is synonymous and interchangeable with the term proletariat, and includes all workers who expend either physical labour or mental labour (salaried knowledge workers and white-collar workers) to produce economic value for the owners of the means of production, the bourgeoisie. Since working-class wages can be very low, and because the state of unemployment is defined as a lack of independent means of generating an income and a lack wage-labour employment, the term working class also includes the lumpenproletariat, unemployed people who are extremely poor.