ˌɪnsəˈleɪʃən 
British ˌɪnsjʊˈleɪʃən
1
: 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
They used fiberglass insulation.
2
a
: the quality or state of being insulated
These materials provide the insulation needed in cold weather.
b
: the act of insulating something
I hired them to do the insulation of the attic. [=to insulate the attic]
Cite this Entry
“Insulation.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/insulation. Accessed 18 Jun. 2026.
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