Entry 1 sense Webster, 1913 Proletarian /prōlˌ-ət-ĕr'-ē-ən/ · Prol·e·ta·ri·an · IPA /ˌpɹoʊ.lɪˈtɛɹi.ən/ 01 a. Of or pertaining to the proletaries; belonging to the commonalty; hence, mean; vile; vulgar. 1. Of or pertaining to the proletaries; belonging to the commonalty; hence, mean; vile; vulgar.