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English definition of “insulation”

insulation

noun [U] uk   /ˌɪn.sjʊˈleɪ.ʃən/ us  
the act of covering something to stop heat, sound, or electricity from escaping or entering, or the fact that something is covered in this way: The animal's thick fur provides very good insulation against the arctic cold.Isolating and separating material that is used to stop heat, sound, or electricity from escaping or entering: Glass fibre is often used as roof insulation.Building materials
(Definition of insulation from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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