This is the 79th most frequent Romanian word.
aceste
"Aceste" means "these" in English.
In this sentence, 'aceste' is a demonstrative adjective that specifies the noun 'cărți' (books), indicating that they are near or specific.
Aceste cărți sunt foarte interesante.
These books are very interesting.
Here, 'aceste' acts as a demonstrative adjective for 'persoane' (people), denoting specific individuals being referred to.
Cunoști pe aceste persoane?
Do you know these people?
In this example, 'aceste' is used to demonstrate 'zile' (days), meaning the days that are defined or known in the context.