GNU Collaborative International Dictionary of English

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Found one definition

  1.       
    
    Whereby , adv.
    1913 Webster
    1. By which; -- used relatively. “You take my life when you take the means whereby I life.”
      Shak.

      1913 Webster
    2. By what; how; -- used interrogatively.
      1913 Webster

      Whereby shall I know this?
      Luke i. 18.

      1913 Webster