Part of speech:

At which.

Part of speech: adverb

At what.

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Usage examples "whereat":

  1. Whereat a great fear seized upon him. - "Stranded in Arcady", Francis Lynde.
  2. Whereat all the little children began dancing and clapping their hands, and Tom danced too with all his might. - "Journeys Through Bookland V2", Charles H. Sylvester.
  3. Elation was stirring his spirit when he gained the first floor and moved toward the foot of the second flight, approaching the spot whereat he was to begin the search for the missing purse. - "The Black Bag", Louis Joseph Vance.