whilst

from The Collaborative International Dictionary of English v.0.48

Whilst \Whilst\, adv. [From {Whiles}; cf. {Amongst}.]
   While. [Archaic]
   [1913 Webster]

         Whilst the emperor lay at Antioch.       --Gibbon.
   [1913 Webster]

   {The whilst}, in the meantime; while. [Archaic.] --Shak.
      [1913 Webster]