This is the 9653rd most frequent Polish word.
xiii
"XIII" is not a Polish word; it is the Roman numeral for 13.
In this sentence, 'XIII' is used as a Roman numeral referring to a specific numbered item on the list.
Numer XIII znajduje się na liście.
Number XIII is on the list.
Here, 'XIII' is employed as a Roman numeral to designate the sequential number of a unit or lesson.
Lekcja XIII obejmuje historię starożytnego Rzymu.
Lesson XIII covers the history of ancient Rome.
In this context, 'XIII' is used as a Roman numeral to identify a chapter within a book.