This is the 2449th most frequent Portuguese word.
cadeiras
Chairs.
'Cadeiras' here again refers to physical chairs, specifically for domestic use.
Comprei novas cadeiras para a cozinha.
I bought new chairs for the kitchen.
Here, 'cadeiras' refers to physical chairs as seating furniture in the classroom.
As cadeiras da sala de aula foram reorganizadas.
The chairs in the classroom were rearranged.
In this usage, 'cadeiras' metaphorically refers to courses or classes within an academic setting.