the 19th century: le XIXe siècle
(a) 19th-century (author): (un auteur) du XIXe siècle
Note the obligatory hyphen when this term is used as an adjective. We say In the 19th century, but a 19th-century phenomenon.
- "The second apartment certainly did have all the "original features" you mentioned, including a 19th century antique toilet (in the garden)."
- "Believe it or not, I studied 19th-century French poetry."
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