insulation

[in-suh-ley-shuhn, ins-yuh-]
noun
1.
material used for insulating.
2.
the act of insulating.
3.
the state of being insulated.

Origin:
1790–1800; insulate + -ion

preinsulation, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insulation (ˌɪnsjʊˈleɪʃən)
 
n
1.  Also called: insulant material used to insulate a body, device, or region
2.  the act or process of insulating

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
When insulating your home, you can choose from many types of insulation.
Faced insulation has paper or foil on one side as a vapor barrier.
The money isn't for insulation per se, it's for approved contractors to apply
  insulation.
Proper insulation conserves heating and cooling energy.
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