This is the 1244th most frequent Polish word.
xix
The term "xix" is not a word in Polish.
Here, 'XIX' is used in a formal context to denote the nineteenth century using Roman numerals, which is standard in historical references.
Podczas imprezy usłyszałem coś interesującego: 'XIX wiek był pełen nowoczesności'.
During the party, I heard something interesting: 'The 19th century was full of modernity'.
In this usage, 'XIX' references a particular century prominently in artistic or scholarly works.
Widziałem dramat pt. 'Historia XIX społeczeństwa'.
I saw a drama titled 'History of the 19th society'.
Here, 'XIX' is questioned for its application as a Roman numeral beyond literary or historical references, pondering its mathematical utility.