Defn: Concerning that. [Scot.]

THEREAT
There*at", adv.

1. At that place; there. Wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat. Matt. vii. 13.

2. At that occurrence or event; on that account. Every error is a stain to the beauty of nature; for which cause it blusheth thereat. Hooker.

THEREBEFORE; THEREBIFORN
There`be*fore", There`bi*forn", adv.

Defn: Before that time; beforehand. [Obs.]
Many a winter therebiforn. Chaucer.

THEREBY
There*by", adv.

1. By that; by that means; in consequence of that. Acquaint now thyself with him, and be at peace; thereby good shall come unto thee. Job xxii. 21.

2. Annexed to that. "Thereby hangs a tale." Shak.

3. Thereabout; — said of place, number, etc. Chaucer.