proletariat (n.)youdaoicibaDictYouDict
also proletariate, "the lowest class," 1853, from French prolétariat, from Latin proletarius (see proletarian). In political economics, "indigent wage-earners," from 1856. Leninist phrase dictatorship of the proletariat attested from 1918.
andragogyyoudaoicibaDictYouDict
"The method and practice of teaching adult learners; adult education", 1920s: blend of andro- and pedagogy.
ability groupingyoudaoicibaDictYouDict
"The organization of pupils into groups according to their perceived ability (either in different schools, or within the same school or class), so that learners of a similar proficiency may be taught together at the same level", Early 20th cent..