(ˈ) ̷ ̷| ̷ ̷ adverb
Etymology: Middle English whare at, from whare, where, wher where + at
1. : at or toward which
an icy tea party, whereat the girl was present, unexplained, unaccounted for, and ignored — Maurice Hewlett
2. : in consequence of which : on which account : whereupon
whereat the seeker after precision may wax angry or sarcastic — H.A.Overstreet