Source : Webster's Revised Unabridged Dictionary (1913)

While \While\, conj.
   1. During the time that; as long as; whilst; at the same time
      that; as, while I write, you sleep. ``While I have time
      and space.'' --Chaucer.

            Use your memory; you will sensibly experience a
            gradual improvement, while you take care not to
            overload it.                          --I. Watts.

   2. Hence, under which circumstances; in which case; though;
      whereas.

   {While as}, {While that}, during or at the time that. [Obs.]