whereat

where·at

W5119100 (wâr-ăt′, hwâr-)conj.1. Toward or at which.2. As a result or consequence of; whereupon.

whereat

(wɛərˈæt) advat or to which placesentence connectorupon which occasion

where•at

(ʰwɛərˈæt, wɛər-)

conj. 1. at which: a reception whereat many were present. 2. to which; whereupon: a remark whereat she quickly angered. [1200–50]
Translations
wobei