English sithen

← Old English siþþan (inherited)

← Old English sīþ (mention)

← Old English þǣm (mention)

← German seitdem (cognate)

← Middle English sithen (inherited)

← Middle English sythyn (mention)

← Old Norse síðan (cognate)

→ English syne (mention)

→ English sith (clipping)

→ English sithence (affix)