THEREIN

therein, in this, in that

(adverb) (formal) in or into that thing or place; “they can read therein what our plans are”

Source: WordNet® 3.1

Etymology

Adverb

therein (not comparable)

(pronominal) in that; in him/her/it

Anagrams

• Therien, etherin, neither, reineth

Source: Wiktionary

There*in", adv.

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition