Whilst is defined as while and refers to things going on at the same time as something else.conjunction
If you fall asleep as you are watching a movie, this is an example of a situation where you fall asleep whilst watching a movie.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
Origin: ME whilest, extended < whiles, whiles
Used by arrangement with John Wiley & Sons, Inc.
conjunction Chiefly British
Origin: Middle English whilest, alteration of whiles, whiles; see whiles.