Where does “thereat” come from?

Thereat derives from Middle English ther, from Old Norse at, from Proto-Germanic þat, from Proto-Indo-European ád, ultimately from the Proto-Indo-European root h₁ed- meaning to go or move.

thereat (English): There; at that place; At that event

Definitions

  1. There; at that place; At that event

Ancestry of “thereat”, step by step

thereat traces back through two separate lines of ancestry.

via English at

StepLanguageWordMeaning
1EnglishatIn, near, or in the general vicinity of a...
2Middle Englishatat; to
3Middle Englishheyehedge, fence; enclosed plot of land, yard;...
4Old Frenchhaie
5Medieval Latinhaga
6Frankishhaggjuhedge
7Proto-Germanichagjōhedge
8Proto-Indo-Europeankagʰyómenclosure, hedge
9Proto-Indo-European-yósCreates adjectives from noun or verb stems

via English there

StepLanguageWordMeaning
1EnglishthereIn a place or location at some distance from the...
2Old Englishþærthere
3Proto-West Germanicþārthere
4Proto-Germanicþarthere, in that place
5Proto-Indo-Europeantar-there
6Proto-Indo-Europeanto-it; that; the, that
7Proto-Indo-Europeanthis; that
Every word from Proto-Indo-European -yósEvery word from Proto-Indo-European kagʰyómEvery word from Proto-Germanic hagjō
thereat — Etymology, Origin & Word History | Etymology Explorer