thereby

adverb

1. by that; by means of that.
2. in that connection or relation: Thereby hangs a tale.
3. by or near that place.
4. Scot. about that number, quantity, or degree.

adverb

1. by that means; because of that
2. archaic by or near that place; thereabouts

adv.Old English þærbig “by means of or because of that;” see there + by. Cf. German dabei, Dutch daarbij.