Etymology
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therefore (adv.)

Old English þærfore; from there + fore, Old English and Middle English collateral form of for. Since c. 1800, therefor has been used in sense of "for that, by reason of that;" and therefore in sense of "in consequence of that." Similar formation in Dutch daarvoor, German dafür, Danish derfor.

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Definitions of therefore

therefore (adv.)
(used to introduce a logical conclusion) from that fact or reason or as a result;
therefore X must be true
Synonyms: hence / thence / thus / so
therefore (adv.)
as a consequence;
Synonyms: consequently
From wordnet.princeton.edu