Definition of whence adverb from the Oxford Advanced Learner's Dictionary

 

whence

 adverb
adverb
BrE BrE//wens//
 
; NAmE NAmE//wens//
 
(old use)
 
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from where They returned whence they had come. Word Origin Middle English whennes, from earlier whenne (from Old English hwanon, of Germanic origin) + -s (later respelled -ce to denote the unvoiced sound).
See the Oxford Advanced American Dictionary entry: whence