This is the 6270th most frequent Polish word.
biegun
Pole (as in geographical pole or extreme point).
Here, 'biegun' refers to the geographic North Pole.
Na mapie zaznaczyliśmy biegun północny.
We marked the North Pole on the map.
In this sentence, 'biegun' describes the magnetic poles of a magnet.
Magnes ma dwa bieguny: północny i południowy.
A magnet has two poles: north and south.
Here, 'biegun' is used metaphorically to refer to opposing viewpoints.