WHILE (4)

While, conj. 1. 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. 2. Hence, under which circumstances; in which case; though; whereas.
While as, While that, during or at the time that.