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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To isn't
00:10
Isn't is always a great word to know.
So is quincunx. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
isn't (ˈɪzənt) [Click for IPA pronunciation guide]
 
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
There isn't a shred of evidence, no track record of safety or scientific
  expertise.
When chickens roost at night, sleep isn't all they do.
There are many reasons why the geoid isn't a sphere.
But for a variety of reasons, it isn't likely to accomplish anything.
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