The story
- Proto-West Germanic · derived from*þananā
- Middle English · inherited fromþennes
- English todaythence
From Middle English þennes, from þenne + -es (“adverbial ending”), the former from þanan, þanona, from Proto-West Germanic *þananā. Cognate with Westphalian Low German diëne.
Etymology from Wiktionary, CC BY-SA 4.0.