Etymology
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proletariat (n.)

also proletariate, "the lowest and poorest class," 1853, from French prolétariat, from Latin proletarius (see proletarian). In political economics, "indigent wage-earners, , the class of wage-workers dependent on daily or casual employment" from 1856. The Englished form proletary was used 16c.-17c. in the older sense and revived in the modern sense by 1865. The Leninist phrase dictatorship of the proletariat is attested from 1918.

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Definitions of proletariat

proletariat (n.)
a social class comprising those who do manual labor or work for wages;
Synonyms: labor / labour / working class
From wordnet.princeton.edu