thereat

UK: /ˌðɛərˈæt/ US: (ᵺâr′at′)

WordReference Random House Unabridged Dictionary of American English © 2026

there•at  (ᵺâr′at′), adv. 

1. at that place or time;
   there:
   Seeing the gate, they entered thereat.
2. because of that;
   thereupon.

• Middle English ther at, Old English thǣr æt. See there, at¹ bef. 900

Collins Concise English Dictionary © HarperCollins Publishers::

thereat / ˌðɛərˈæt/ adverb

1. at that point or time
2. for that reason