What's the difference between until and while?

Until

Definition:

• (prep.) To; unto; towards; -- used of material objects.
• (prep.) To; up to; till; before; -- used of time; as, he staid until evening; he will not come back until the end of the month.
• (conj.) As far as; to the place or degree that; especially, up to the time that; till. See Till, conj.

Example Sentences:

While

Definition:

• (n.) Space of time, or continued duration, esp. when short; a time; as, one while we thought him innocent.
• (n.) That which requires time; labor; pains.
• (v. t.) To cause to pass away pleasantly or without irksomeness or disgust; to spend or pass; -- usually followed by away.
• (v. i.) To loiter.
• (conj.) During the time that; as long as; whilst; at the same time that; as, while I write, you sleep.
• (conj.) Hence, under which circumstances; in which case; though; whereas.
• (prep.) Until; till.

Example Sentences: