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From the Old English pronominal adverb therfore; see there, fore, and for. Compare Dutch daarvoor, Danish and Norwegian derfor, Swedish därför, därföre.



therefore (not comparable)

  1. (conjunctive) For that or this purpose, referring to something previously stated.
  2. (conjunctive) Consequently, by or in consequence of that or this cause; referring to something previously stated.
    • 1637, René Descartes, Discourse on the Method:
      Je pense, donc je suis (I think, therefore I am)
    • 1898, Winston Churchill, chapter 1, The Celebrity:
      In the old days, to my commonplace and unobserving mind, he gave no evidences of genius whatsoever. He never read me any of his manuscripts,  [] , and therefore my lack of detection of his promise may in some degree be pardoned.
    • 2012 March-April, Terrence J. Sejnowski, “Well-connected Brains”, American Scientist, volume 100, number 2, page 171: 
      Creating a complete map of the human connectome would therefore be a monumental milestone but not the end of the journey to understanding how our brains work.
    • (Can we date this quote?), Spectator
      He blushes; therefore he is guilty.


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