Definitions

1. adverb

from some unknown or unspecified place; from an unknown source

“The treasure was said to have originated somewhence in the ancient city.”

2. noun

a place or source that is unknown or unspecified

“The origins of the mysterious artifact remain a mystery somewhence in the depths of the forest.”

3. adverb (archaic)

from a remote or distant place; from afar

“The wise old sage was said to have come somewhence from the farthest lands.”