Columbia subject headings:
Humboldt, Wilhelm von, 1767-1835.
Language and languages--Philosophy.
Language and languages.
Harvard subject headings:
Act (Philosophy)
Humboldt, Wilhelm von, 1767-1835--Contributions in philosophy of language.
Language and languages--Philosophy
Linguistics--History--20th century
Princeton subject headings:
Humboldt, Wilhelm von, 1767-1835.
Language and languages--Philosophy.