Whereat

ahd-5
  • conjunction. Toward or at which.
  • conjunction. As a result or consequence of; whereupon.
  • The Century Dictionary and Cyclopedia
  • At what? as, whereat are you offended?
  • At which.
  • the GNU version of the Collaborative International Dictionary of English
  • adverb. At which; upon which; whereupon; -- used relatively.
  • adverb. At what; -- used interrogatively; as, whereat are you offended?
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • conjunction. at which, or toward which
  • conjunction. because of which; whereupon