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In the Soviet Union: an organization set up in 1917 to promote proletarian cultural activity; (also) culture reflecting or encouraging a purely proletarian ethos.
The Soviet organization was dissolved in 1932.
Early 20th century; earliest use found in Stevens Point Daily Journal. From Russian proletkul′t from prolet- (in proletarskaja, feminine of proletarskij proletarian) + kul′t- (in kul′tura culture), short for proletarskaja kul′tura proletarian culture.