up to the time that or when; till: He read until his guests arrived.
before (usually used in negative constructions): They did not come until the meeting was half over.
onward to or till (a specified time or occurrence): She worked until 6 p.m.
before (usually used in negative constructions): He did not go until night.
Scot. and North England. to; unto.

1150–1200; Middle English untill, equivalent to un- (< Old Norse unz up to, as far as) + till till1

See till1.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
until (ʌnˈtɪl)
1.  up to (a time) that: he laughed until he cried
2.  (used with a negative) before (a time or event): until you change, you can't go out
3.  (often preceded by up) in or throughout the period before: he waited until six
4.  (used with a negative) earlier than; before: he won't come until tomorrow
usage  The use of until such time as (as in industrial action will continue until such time as our demands are met) is unnecessary and should be avoided: industrial action will continue until our demands are met

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1200, from O.N. und "as far as, up to" (related to O.E. end; see end) + till "until, up to" (see till). Originally also used of persons and places. Cf. Swed. intill, Dan. indtil. The Mod.Ger. equivalent, bis (O.H.G. biaz), is a similar compound, of O.H.G. bi "by, at, to" and zu "to."
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

until definition

while loop

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Idioms & Phrases


see put off until tomorrow; talk one's arm off (until blue in the face). Also see under till.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Review of applications will begin immediately and continue until position is
The wallpaper image will remain until the computer is restarted.
Steel cables stretched over the giant pylons provided support until the arch
  was completed.
Seeds cannot germinate until certain favorable environmental conditions are met.
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