when's

when's

[hwenz, wenz]
1.
contraction of when is: When's the show over?
2.
contraction of when does: When's the next train leave?
3.
contraction of when has: When's he ever been an authority?

See contraction.
Dictionary.com Unabridged

when

[hwen, wen; unstressed hwuhn, wuhn]
adverb
1.
at what time or period? how long ago? how soon?: When are they to arrive? When did the Roman Empire exist?
2.
under what circumstances? upon what occasion?: When is a letter of condolence in order? When did you ever see such a crowd?
conjunction
3.
at what time: to know when to be silent.
4.
at the time or in the event that: when we were young; when the noise stops.
5.
at any time; whenever: He is impatient when he is kept waiting.
6.
upon or after which; and then: We had just fallen asleep when the bell rang.
7.
while on the contrary; considering that; whereas: Why are you here when you should be in school?
pronoun
8.
what time: Till when is the store open?
9.
which time: They left on Monday, since when we have heard nothing.
noun
10.
the time of anything: the when and the where of an act.

Origin:
before 1000; Middle English when(ne), Old English hwenne; cognate with German wann when, wenn if, when (compare Gothic hwan when, how); akin to who, what

1. when, whence ; 2. wen, when.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
when (wɛn)
 
adv
1.  a.  at what time? over what period?: when is he due?
 b.  (used in indirect questions): ask him when he's due
2.  say when to state when an action is to be stopped or begun, as when someone is pouring a drink
3.  (subordinating) at a time at which; at the time at which; just as; after: I found it easily when I started to look seriously
4.  although: he drives when he might walk
5.  considering the fact that: how did you pass the exam when you'd not worked for it?
6.  at which (time); over which (period): an age when men were men
 
n
7.  (usually plural) a question as to the time of some occurrence
 
usage  When should not be used loosely as a substitute for in which after a noun which does not refer to a period of time: paralysis is a condition in which (not when) parts of the body cannot be moved

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

when
O.E. hwænne, hwenne, hwonne, from Gmc. pronomial stem *khwa- (cf. O.S. hwan, O.Fris. hwenne, M.Du. wan, O.H.G. hwanne, Ger. wann "when"), from PIE interrogative base *qwo- (see who).
Online Etymology Dictionary, © 2010 Douglas Harper
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