Longman Dictionary of Contemporary English homepage

while

1 conjunction
     
while1 S1 W1
1 during the time that something is happening:
They arrived while we were having dinner.
While she was asleep, thieves broke in and stole her handbag.
She met Andy while working on a production of Carmen.
see usage note during
2 all the time that something is happening:
Would you look after the children while I do the shopping?
3 used to emphasize the difference between two situations, activities etc:
Schools in the north tend to be better equipped, while those in the south are relatively poor.
4 in spite of the fact that [= although]:
While never a big eater, he did snack a lot.
While there was no conclusive evidence, most people thought he was guilty.
5

while I'm/you're etc at/about it

spoken used to suggest that someone should do something at the same time that they do something else:
Print out what you've written, and while you're at it make a copy for me.

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