This is the 708th most frequent Serbian word.
хиљада
The Serbian word "хиљада" means "thousand" in English.
Here, 'хиљада' is used as a part of a numerical expression indicating the exact number 1000.
Video sam hiljadu ptica na nebu.
I saw a thousand birds in the sky.
In this sentence, 'хиљада' is used to represent an approximate large amount described as 'several thousand'.
Na koncertu je bilo nekoliko хиљада ljudi.
There were several thousand people at the concert.
Here, 'хиљада' is used similarly to denote a descriptive measurement of magnitude in the range of thousand.