in·​su·​la·​tion | \ ˌin(t)-sə-ˈlā-shən How to pronounce insulation (audio) \

Definition of insulation

1 : material used in insulating
2a : the state of being insulated
b : the action of insulating

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Examples of insulation in a Sentence

These materials provide the insulation needed in cold weather. she had grown up in such rural insulation that she'd never met anyone of a different race
Recent Examples on the Web The coat hits around mid-thigh, and is filled with PrimaLoft insulation that’s as warm as down but made entirely of fibers from recycled water bottles (18 of them, to be exact). Madison Flager, Condé Nast Traveler, "Madewell and Buffy Just Dropped a Cozy Essentials Collection," 19 Nov. 2020 The complex process used to make aerogel means it’s currently pricier than other forms of insulation on the market—$1 per cubic centimeter—though Grossman is optimistic that manufacturing techniques can bring costs down in the future. Corryn Wetzel, Smithsonian Magazine, "Why This New Technology Inspired by Camel Fur Is Super Cool," 11 Nov. 2020 Full of insulation that will keep you toasty, whether bingeing Netflix inside or sitting fireside outside, the weather-resistant, water-repellant blankets come in a variety of supercool patterns too. Courtney Thompson, CNN Underscored, "The snuggliest blankets to wrap yourself up in this year," 5 Nov. 2020 Now to the feel: structured but soft with insulation that felt considerable but not confining. Emily Ruane,, "Allbirds’ New Eco-Apparel Is Here — & We Wore It First," 20 Oct. 2020 The carrier’s focus on leisure travel has provided a measure of insulation from the plunge in corporate and international demand. Mary Schlangenstein,, "Allegiant Defies Travel Collapse, Weighs Used Airbus Jets," 12 Oct. 2020 Of course, the $2.40 a day is for an average worker with average costs, but can be tweaked depending on measures such as home heating and water costs, or the quality of insulation. Toby Sterling, The Christian Science Monitor, "In the work-from-home era, who pays for coffee and toilet paper?," 7 Oct. 2020 So far, the 100-gram insulation has proved to be fairly warm. Adrienne Donica, Popular Mechanics, "Winter is No Match for These Top-Performing Snow Boots," 5 Nov. 2020 The quail seemed to be wearing heavy coats this morning, no doubt just an illusion from feathers that are puffed up to provide better insulation from the misty rain and morning chill. San Diego Union-Tribune, "Column: Flocks of fluttering visitors brighten gray day during sit and see," 31 Oct. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'insulation.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of insulation

1798, in the meaning defined at sense 2b

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Time Traveler for insulation

Time Traveler

The first known use of insulation was in 1798

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Statistics for insulation

Last Updated

22 Nov 2020

Cite this Entry

“Insulation.” Dictionary, Merriam-Webster, Accessed 28 Nov. 2020.

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More Definitions for insulation


How to pronounce insulation (audio)

English Language Learners Definition of insulation

: 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
: the act of insulating something


in·​su·​la·​tion | \ ˌin-sə-ˈlā-shən How to pronounce insulation (audio) \

Kids Definition of insulation

1 : material that is used to stop the passage of electricity, heat, or sound from one conductor to another
2 : the act of insulating : the state of being insulated insulation of wires


in·​su·​la·​tion | \ ˌin(t)-sə-ˈlā-shən How to pronounce insulation (audio) \

Medical Definition of insulation

1 : the action of separating a conductor from conducting bodies by means of nonconductors so as to prevent transfer of electricity, heat, or sound also : the state resulting from such action
2 : material used to provide insulation

Other Words from insulation

insulate \ ˈin(t)-​sə-​ˌlāt How to pronounce insulate (audio) \ transitive verb insulated; insulating

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