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Source: Dictionary.com
heretofore:
Definition: before this time; until now
Example: Diseases that heretofore were usually confined to rural areas.
Hitherto:
Definition: up until this time; until now
Example: hitherto imperturbable, he now showed signs of alarm
No matter how I interpret it, I always perceive these two words as having the same dictionary definition of "being the case (or not being the case) until the present now".
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