This is the 553rd most frequent Spanish word.
nueve
The number nine.
Here, 'nueve' is used as a cardinal number to indicate the quantity of books in the collection.
Tengo una colección de nueve libros.
I have a collection of nine books.
In this sentence, 'nueve' specifies the hour of the evening, serving as a reference to the time.
El tren llega a las nueve de la noche.
The train arrives at nine in the evening.
This usage of 'nueve' references a year in historical context and serves as a descriptor of the era.