This is the 938th most frequent Portuguese word.
piso
"Floor" or "level" (of a building).
Here, 'piso' refers to the surface of a room, specifically the floor on which we walk.
O piso da sala está muito limpo.
The floor of the living room is very clean.
Here, 'piso' refers to a minimum threshold, specifically the baseline of a salary structure, showing a figurative usage.
O novo funcionário foi promovido para um piso salarial mais alto.
The new employee was promoted to a higher salary level.
In this sentence, 'piso' again means the surface of the floor, but its usage is associated with an action taking place, implying context to its material or condition.