What's the difference between hereinbefore and whereat?

Hereinbefore


Definition:

  • (adv.) In the preceding part of this (writing, document, book, etc.).

Example Sentences:

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".