/ ðens; NAmE / adverb
( old use or formal ) from that place; following that :
They made their way from Spain to France and thence to England.
He was promoted to manager, thence to a partnership in the firm.
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WORD ORIGIN
Middle English thennes , from earlier thenne (from Old English thanon , of West Germanic origin) + -s (later respelled -ce to denote the unvoiced sound).