Third world; Dritte Welt; Globaler Süden; Global South; Developing countries ; Second language acquisition (language teaching) ; Zweitspracherwerb (Unterricht) ; Foreign language teaching ; English as a second language; ESL; TESOL ; Periphery (linguistic geography) ; Core/periphery (linguistic geography) ; Three circles model (of world Englishes) ; Center/periphery (linguistic geography) ; English as international medium ; Other varieties of English
