in·​su·​la·​tion | \ˌin(t)-sə-ˈlā-shən \

Definition of insulation 

1a : the action of insulating

b : the state of being insulated

2 : material used in 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

Breeds with thicker plumage do better in cold climates, while those without a lot of extra insulation, such as Silkies (a fabulously ornamental breed with feathers that look more like fur) live comfortably in warmer climates. Denise Foley, Good Housekeeping, "Everything You Need to Know About Raising Backyard Chickens," 14 Aug. 2018 Copper wire stripped of its insulation in preparation for recycling. Christopher Alessi, WSJ, "Speculative Buyers Bid Up Copper," 9 Aug. 2018 Follow this advice to protect your down insulation from moisture. Andrew Skurka, Outside Online, "How to Pack for a Hike," 21 May 2018 For fair-weather animals, this swimming would be deadly, because their insulation mostly relies on the air trapped between hairs. Chris Lee, Ars Technica, "Porous silk fiber traps heat, hides a rabbit from IR camera," 4 Apr. 2018 Ford added all kinds of equipment and sound insulation that serve to offset some of the benefit of lightweight aluminum. Aaron Bragman, USA TODAY, "Review: Ford's revamped Expedition SUV moves to the front of the pack," 13 July 2018 Other options include adding extra insulation around mechanicals or purchasing furniture with plusher upholstery. Alina Dizik, WSJ, "Quieting the High-Tech Luxury Home," 28 June 2018 Sisco, who will be attending Aurora Christian High School in the fall, spent the mission trip putting siding and foam board insulation on a mobile home as part of the Appalachia Service Project’s summer program. Cathy Janek, Aurora Beacon-News, "Batavia United Methodist mission trip called a 'life-changing' experience," 25 June 2018 Starting in 2020, California officials want all new houses built in the state to generate their own solar power during the day and sip electricity at night, their energy use cut by highly efficient insulation. David R. Baker, San Francisco Chronicle, "The clean-energy home of the future ... outside Fresno," 18 May 2018

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 1a

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Last Updated

19 Nov 2018

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Time Traveler for insulation

The first known use of insulation was in 1798

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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 \

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 \

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 \ transitive verb insulated; insulating

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Comments on insulation

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by force of circumstances

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