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whence (adv., conj.)
[whence 词源字典]
early 13c.,
whennes
, with adverbial genitive
-s
, from Old English
hwanone
, related to
hwænne
(see
when
). Spelling with
-ce
(1520s) reflects the voiceless pronunciation.
[whence etymology, whence origin, 英语词源]