asiento
/aˈsjento/ · A2 · noun · m
seat
💺 asiento = a + siento: from sentar, to sit — the thing you sit on
From asentar (to seat, to settle), built on sentar, to sit. All three meanings share the idea of settling: a seat is where you settle, sediment is what settles to the bottom, and a treaty is a matter that has been settled.