What's the difference between thereat and whereat?

Thereat


Definition:

  • (adv.) At that place; there.
  • (adv.) At that occurrence or event; on that account.

Example Sentences:

  • (1) Factors and methods being complementary and such having an effect of contrary sence are thereat especially described.

Whereat


Definition:

  • (adv.) At which; upon which; whereupon; -- used relatively.
  • (adv.) At what; -- used interrogatively; as, whereat are you offended?

Example Sentences:

  • (1) ), whereat measurements can be taken either using cylindrical graphitic walls or "no walls".