The Collaborative International Dictionary of English v.0.48:

Or \Or\, prep. & adv. [AS. ?r ere, before. [root]204. See Ere,
   prep. & adv.]
   Ere; before; sooner than. [Obs.]
   [1913 Webster]

         But natheless, while I have time and space,
         Or that I forther in this tale pace.     --Chaucer.
   [1913 Webster]

   Or ever, Or ere. See under Ever, and Ere.
      [1913 Webster]