Usage Note
XVIII (diciottesimo) marks the 18th position. The 18th century (1700s) is called il Settecento in Italian historical usage. Diciottesimo also appears in everyday contexts: il diciottesimo compleanno (18th birthday) marks the Italian age of majority, making it culturally significant.
Examples
"Il diciottesimo compleanno è speciale."
Natural Translation
The eighteenth birthday is special.

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