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 ]