from The American Heritage® Dictionary of the English Language, 4th Edition
- prep. Up to the time of: We danced until dawn.
- prep. Before (a specified time): She can't leave until Friday.
- prep. Scots Unto; to.
- conj. Up to the time that: We walked until it got dark.
- conj. Before: You cannot leave until your work is finished.
- conj. To the point or extent that: I talked until I was hoarse. See Usage Note at till2.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- prep. Up to the time of (something happening).
- prep. Before (a time).
- conj. Up to the time that (a condition becomes true).
- conj. Before (a condition becoming true).
from the GNU version of the Collaborative International Dictionary of English
- prep. To; unto; towards; -- used of material objects.
- prep. To; up to; till; before; -- used of time.
- conj. As far as; to the place or degree that; especially, up to the time that; till. See till, conj.
from The Century Dictionary and Cyclopedia
- To; unto: of place.
- To; unto; up to: of time.
- Up to the time that; till the point or degree that: preceding a clause.
Middle English : un-, up to (from Old Norse und; see ant- in Indo-European roots) + til, till; see till2.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Old Norse und ("as far as, up to") and til ("until, up to") (Wiktionary)