THEREIN', adverb [there and in.] In that or this place, time or thing. Bring forth abundantly in the earth and multiply therein Genesis 9:7. Ye shall keep the sabbath--whosoever doeth any work therein--that soul shall be cut off. Exodus 31:14. THEREIN our letters do not well agree.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI