Usage Note
Quindicesimo is the ordinal numeral for 15th, agreeing in gender and number with the noun: il quindicesimo piano (the fifteenth floor), la quindicesima edizione (the fifteenth edition). In Italian ordinals from 11th onwards are formed by adding -esimo to the cardinal; quindici drops the final -i before -esimo, giving quindic-esimo.
Examples
"È arrivata quindicesima nella gara."
Natural Translation
She finished fifteenth in the race.

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