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insulation

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insulation/ˌɪnsəˈleɪʃən/
British/ˌɪnsjʊˈleɪʃən/noun
insulation
/ˌɪnsəˈleɪʃən/British/ˌɪnsjʊˈleɪʃən/
noun
Learner's definition of INSULATION  
[noncount]
: a material or substance that is used to stop heat, electricity, or sound from going into or out of something : a material that insulates something
: the quality or state of being insulated
   b  : the act of insulating something
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