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.
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            Use your memory; you will sensibly experience a
            gradual improvement, while you take care not to
            overload it.                          --I. Watts.
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   2. Hence, under which circumstances; in which case; though;
      whereas.
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   While as, While that, during or at the time that. [Obs.]
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