Part of speech: adverb

Upon that.

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Usage examples "thereat":

  1. And thee to be galled thereat. - "The Three Heron's Feathers", Hermann Sudermann.
  2. The attendance thereat had been enormous, as usual- some thirty- five thousand people. - "The Chronicles of a Gay Gordon", José Maria Gordon.
  3. The lady passed on; not, however, failing to notice that the lamp stopped at a door on the way, and that its bearer was twice going to knock thereat and didn't. - "When Ghost Meets Ghost", William Frend De Morgan.