This is the 4903rd most frequent German word.
aha
An exclamation indicating realization, understanding, or surprise.
The word 'aha' here is used as an expression of sudden realization upon understanding something.
Aha, jetzt verstehe ich es.
Aha, now I understand it.
In this sentence, 'aha' is employed ironically or dismissively, signaling a departure or decision without further elaboration.
Ich dachte, sie kommt, aber sie hat 'Aha' gesagt und ist gegangen.
I thought she was coming, but she said 'Aha' and left.
Here, 'aha' is described as a neutral affirming interjection, used to express agreement or acknowledgment.