Added 9 October 2026
therein
/ˈðɛəɹˈɪn/ adverb
adverb Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about therein at Wordnik → Where our words come from →
Origin
From Middle English theryn, ther-inne, þer-in, from Old English þǣrin, þǣrinne, from Proto-West Germanic *þārin, *þārinna, from Proto-Germanic *þarin, *þarinna, equivalent to there + in. Cognate with Saterland Frisian deerin (“therein”), West Frisian dêryn (“therein”), Dutch daarin (“therein”), German Low German daarin (“therein”), German darin, drin (“therein”), Danish deri (“therein”), Swedish däri (“therein”), Icelandic þar í (“therein”).
From Wiktionary, via Kaikki.org (CC BY-SA)