What's the difference between hereupon and whereat?

Hereupon


Definition:

  • (adv.) On this; hereon.

Example Sentences:

  • (1) The authors have established normative values of the ERP and the factors which might be of influence hereupon.
  • (2) Because of the extended contamination and the splintered fracture radical wound excision - involving also the chondral surfaces - has been performed and hereupon humero-radial arthrodesis was carried out.

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".