Noun
(uncountable) The political character and practice of the proletariat; advocacy or advancement of the proletariat’s interests.
(uncountable) The state, quality, or condition of being a proletarian.
(countable) A proletarian word or turn of phrase; a vulgarism.
(uncountable, rare) Proletarians regarded as a class; the proletariat.
Source: en.wiktionary.org