Webster’s Revised Unabridged Dictionary · 1913
Wherefore
Where′fore (hwâr′fōr), adv. & conj. [Where + for.]
1. For which reason; so; — used relatively.
Wherefore by their fruits ye shall know them. Matt. vii. 20.
2. For what reason; why; — used interrogatively.
But wherefore that I tell my tale. Chaucer.
Wherefore didst thou doubt? Matt. xiv. 31.
Where′fore, n. the reason why. [Colloq.]