This is the 217th most frequent Danish word.
fleste
"Fleste" means "most" in English.
Here, 'fleste' is used with 'de' (the) to indicate the majority but not all of the students.
De fleste elever i klassen forstod lektien.
Most of the students in the class understood the lesson.
In this sentence, 'fleste' is used with 'de' to describe that the majority of the recommended books were read.
Jeg har allerede læst de fleste af de bøger, du anbefalede.
I have already read most of the books you recommended.
'Fleste' here indicates the majority of instances, showing that this phrase describes frequency.