Dictionary.net

• (abbr. Lit. Hum.). Polite letters, esp. as name of classical school or examination for B.A. degree at Oxford. [Latin]

1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry

• [L.] (Univ.) The more refined, i.e. higher, literature or learning.

1895 - Glossary of terms and phrases
By Henry Percy Smith