Wherefore

Part of speech: noun (n.)

the reason why. [Colloq.]

Part of speech: adverb (adv.)

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.