What does the word grade mean?

Usage examples for grade

  1. " It is a low- grade ore, you know," explained Jack, feeling bound to express his own doubts of its value. – Peter A Novel of Which He is Not the Hero by F. Hopkinson Smith
  2. It's steep up- grade coming east. – The U.P. Trail by Zane Grey
  3. It carried big logs with it, and maybe that water didn't make some time on the down grade. – I Married a Ranger by Dama Margaret Smith