Medieval theory of language; Middle Ages (theory of language) ; History of linguistics (19th century) ; History of linguistics (20th century) ; Language planning; Purification of language; Sprachpurismus; Sprachverfall; Language decay; Language cultivation ; Loan word dictionary ; Arabism ; Gallicism ; Integration (lex.) ; Loan assimilation ; Turkismus; Turcism ; Persisch; Neupersisch; Persian