Etymology
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hitherto (adv.)

c. 1200, from hither + to.

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Definitions of hitherto

hitherto (adv.)
used in negative statement to describe a situation that has existed up to this point or up to the present time;
Synonyms: so far / thus far / up to now / heretofore / as yet / yet / til now / until now
From wordnet.princeton.edu