This is the 3249th most frequent Dutch word.
geworden
"Geworden" means "become" or "turned into."
In this sentence, 'geworden' is used as the past participle of 'worden' (to become), indicating a completed action of changing a state or profession.
Hij is een dokter geworden.
He has become a doctor.
Here, 'geworden' describes a transition in the state of the environment (from light to dark).
Het is donker geworden buiten.
It has become dark outside.
In this context, 'geworden' reflects a gradual improvement or development in skill over time.