'Thereby' definitions:

Definition of 'thereby'

From: WordNet
adverb
By that means or because of that; "He knocked over the red wine, thereby ruining the table cloth"

Definition of 'Thereby'

From: GCIDE
  • Thereby \There*by"\, adv.
  • 1. By that; by that means; in consequence of that. [1913 Webster]
  • Acquaint now thyself with him, and be at peace; thereby good shall come unto thee. --Job xxii. 21. [1913 Webster]
  • 2. Annexed to that. "Thereby hangs a tale." --Shak. [1913 Webster]
  • 3. Thereabout; -- said of place, number, etc. --Chaucer. [1913 Webster]