isn't

[iz-uhnt]
contraction of is not.

See contraction.


Isn't is often pronounced [id-nt] in the South Midland and Southern U.S., with [d] a stop consonant, substituting for [z] a sibilant. This substitution results from an assimilatory process in which the tip of the tongue, in anticipation of the articulatory position for the following [n] touches the upper alveolar ridge. This same process gives [wuhd-nt] for wasn't and [bid-nis] for business. These pronunciations are heard from speakers on all social levels.
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World English Dictionary
isn't (ˈɪzənt)
 
contraction of
is not

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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Example sentences
Print is a proper vehicle for the latter, but it isn't for the former.
Well, but he isn't sent to school for that-at any rate, not for that mainly.
It isn't becoming to you, really-except as an obvious pose.
Even though polystyrene forks are not biodegradable, keeping and reusing them
  isn't a great idea.
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