Meaning of quod erat demonstrandum*

quod e•rat de•mon•stran•dum

Pronunciation: (kwôd e'rät dā"môn-strän'doom Eng. kwod er'&schwat dem"&schwan-stran'd&schwam), [key]
— Latin. Latin.
  1. which was to be shown or demonstrated.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.