[1] : The Collaborative International Dictionary of English v.0.48

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.
      1913 webster

            use your memory; you will sensibly experience a
            gradual improvement, while you take care not to
            overload it.                          --i. watts.
      1913 webster

   2. hence, under which circumstances; in which case; though;
      whereas.
      1913 webster

   while as, while that, during or at the time that. obs.
      1913 webster
see also:
while as while that 

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