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Definition of wherefore : 1. For what reason; why; - used interrogatively.
2. For which reason; so; - used relatively.
3. the reason why.

Synonyms:

cause, then, reason, occasion, whence, consequently, argument, necessity, proof, wherefor, why, thereupon, call, justification, ground, accordingly, start

on account of, therefore, because, owing to, since, ergo, thus, hence, thence, so, thanks to, due to

Usage examples:

• And they gathered themselves together against Moses and against Aaron, and said unto them, Ye take too much upon you, seeing all the congregation are holy, every one of them, and the Lord is among them: wherefore then lift you up yourselves above the congregation of the Lord? - "The Emancipation of Massachusetts", Brooks Adams.
• Tom forced a smile, and hoped it was a natural one, as he asked gaily: " And wherefore this fear for me, good mine host?" - "Tom Tufton's Travels", Evelyn Everett-Green.
• We know you all trust us both and so we don't want you to ask the why or the wherefore, but just go ahead and do it. - "The Enchanted Canyon", Honoré Willsie Morrow.