This is the 3826th most frequent German word.
seitdem
"Seitdem" means "since then."
In this sentence, 'seitdem' introduces a subordinate clause to indicate the time starting from the school's beginning.
Seitdem die Schule begonnen hat, ist er sehr beschäftigt.
Since school started, he has been very busy.
Here, 'seitdem' is used as an adverb referring to the time following a previously mentioned event.
Er hat sich seitdem nicht mehr gemeldet.
He has not reached out since then.
In this example, 'seitdem' serves as a temporal adverb modifying the verb 'besucht', indicating recurring actions from a specific time onward.