This is the 170th most frequent Polish word.
wysokości
"Height" or "altitude."
In this context, 'wysokości' relates to 'heights', meaning the state of being at a height and indicating physical elevation.
Mam lęk wysokości.
I have a fear of heights.
In this sentence, 'wysokości' is part of the phrase 'wysokość opłaty', meaning 'amount of the fee', which relates to a financial value or amount.
Komisja ustaliła wysokość opłaty.
The committee determined the amount of the fee.
Here, 'wysokości' refers to 'altitude', indicating the height above a specific baseline.