nf. surface, exterior or upper boundary of a thing, external part or layer; plane, flat surface on which any geometrical line that joins two points can lie (Geometry); two-dimensional surface (Art)

The following video provides you with the correct English pronunciation of the word "płaszczyzna", to help you become a better English speaker.

zny -zny)(loc sg -źnie) f ( GEOM)plane płaszczyzna porozumienia common ground

plane