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From 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]