Also means
since
Usage Note
seitdem works two ways: as an adverb it means 'since then', and as a subordinating conjunction it means 'ever since' and sends the verb to the end of the clause. Don't confuse it with the preposition seit, which takes a noun, not a clause.
Examples
"Seitdem habe ich ihn nicht gesehen."
Natural Translation
I haven't seen him since then.
Literal Translation
Since-then have I him not seen.

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