This is the 16th most frequent Estonian word.
palju
"Palju" means "much" or "a lot" in English.
Here, 'palju' is used as a quantifier to indicate a large number of items (books).
Mul on palju raamatuid.
I have many books.
In this sentence, 'palju' is functioning as an intensifier to denote a significant amount of abstract concepts (joy and laughter).
Oli palju rõõmu ja naeru peol.
There was much joy and laughter at the party.
In this use, 'palju' represents a high degree of something abstract (warmth).