What does the word Thereat mean?

Usage examples for Thereat

  1. And thee to be galled thereat. – The Three Heron's Feathers by Hermann Sudermann
  2. The attendance thereat had been enormous, as usual- some thirty- five thousand people. – The Chronicles of a Gay Gordon by 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 by William Frend De Morgan