This is the 10675th most frequent Spanish word.
decimoquinto
"Decimoquinto" means "fifteenth" in English.
In this sentence, 'decimoquinto' is used as an ordinal numeral to denote the fifteenth occurrence of an event, specifically an anniversary.
Hoy celebramos el aniversario decimoquinto de la fundación.
Today we celebrate the fifteenth anniversary of the foundation.
Here, 'decimoquinto' serves as an ordinal numeral to indicate the fifteenth position in a numbered list, which is the world ranking.
El jugador ocupa el decimoquinto lugar en el ranking mundial.
The player is ranked fifteenth in the world ranking.
In this example, 'decimoquinta' is the feminine form of the ordinal numeral 'decimoquinto', showing agreement with the gender of the noun 'persona', and indicates the sequence of arrival.