siþþan

Part of speech: adverb, conjunction
1. afterwards, thereafter, since; 2. after that, since, when (also siððan, siþþon, siððon, sioþþan, sioððan, seoþþan, seoððan, syþþan, syððan)
Etymology
[Mod E SINCE ← síþ adv “after; afterwards, later” + þan (← þám, þǽm – Dat case of demonstr pron se)