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