From every place or direction; from all sources or origins.
Compound of 'every' and 'whence' (Middle English from 'when' + '-ce', meaning from where/source). An archaic formation paralleling the 'every-' + interrogative pattern.
This word is so archaic that it barely appears even in historical texts—'whence' itself (meaning 'from where') is archaic, and adding 'every' to it created something almost nobody uses even when they use 'whence'!
Complete word intelligence in one call. Free tier — 50 lookups/day.