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therefore

[th air-fawr, -fohr] /ˈðɛərˌfɔr, -ˌfoʊr/
adverb
1.
in consequence of that; as a result; consequently:
I think; therefore I am.
Origin of therefore
1125-1175
1125-75; Middle English ther(e)fore, variant of therfor therefor
Can be confused
therefor, therefore (see synonym study at the current entry)
Synonyms
hence, whence. Therefore, wherefore, accordingly, consequently, so, then all introduce a statement resulting from, or caused by, what immediately precedes. Therefore (for this or that reason) and wherefore (for which reason) imply exactness of reasoning; they are especially used in logic, law, mathematics, etc., and in a formal style of speaking or writing. Accordingly (in conformity with the preceding) and consequently (as a result, or sequence, or effect of the preceding), although also somewhat formal, occur mainly in less technical contexts. So (because the preceding is true or this being the case) and then (since the preceding is true) are informal or conversational in tone.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for therefore

therefore

/ˈðɛəˌfɔː/
sentence connector
1.
thus; hence: used to mark an inference on the speaker's part: those people have their umbrellas up: therefore, it must be raining
2.
consequently; as a result: they heard the warning on the radio and therefore took another route
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for 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."

Online Etymology Dictionary, © 2010 Douglas Harper
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