Webster’s Revised Unabridged Dictionary · 1913
Therein
There·in′ (·ĭn′), adv. In that or this place, time, or thing; in that particular or respect. Wyclif.
He pricketh through a fair forest, Therein is many a wild beast. Chaucer.
Bring forth abundantly in the earth, and multiply therein. Gen. ix. 7.
Therein our letters do not well agree. Shak.