Questions & Answers about La puerta permaneció cerrada.
Permaneció is the preterite form of permanecer, meaning remained or stayed.
So La puerta permaneció cerrada means the door remained/stayed closed.
Compared with estuvo cerrada:
- estuvo cerrada = was closed
- permaneció cerrada = remained closed / stayed closed
Permanecer emphasizes that the state continued over a period of time. It sounds a bit more formal and more precise than estar.