While

1. n. That which requires time; labor; pains.
2. n. Space of time, or continued duration, esp. when short; a time; as, one while we thought him innocent.
3. v. i. To loiter.
4. conj. During the time that; as long as; whilst; at the same time that; as, while I write, you sleep.
5. conj. Hence, under which circumstances; in which case; though; whereas.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.