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