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

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 vibrations coming through the ceiling will be almost impossible to mitigate without opening up the ceiling and putting in vibration-dampening, then installing soundproofing insulation and wallboard — a very daunting challenge., 31 Oct. 2021 Besides helping to prevent freezing, which could cause the pipes to burst, insulation keeps the water in hot-water lines hotter and helps prevent condensation on cold-water lines in the summer. Washington Post, 29 Oct. 2021 Behind the faucet mounting plate, install 1/2-inch plywood in place of insulation board. Merle Henkenius, Popular Mechanics, 12 July 2021 The double wall vacuum insulation keeps hot drinks hot for over three hours and cold drinks cold for nine hours. Chris Hachey, BGR, 20 May 2021 The double-wall vacuum insulation will keep your drinks at the perfect temperature for hours. Fiona Tapp, CNN Underscored, 26 Mar. 2021 The rubber neither lets water in or scent escape, and the insulation keeps you warm during long waits on the stand. Outdoor Life, 16 Mar. 2021 Its rugged design and double-walled vacuum insulation keep drinks cold longer. Sian Babish,, 6 Mar. 2021 The PrimaLoft synthetic insulation keeps your feet warm. Gear Team, Wired, 20 Feb. 2021

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.

See More

First Known Use of insulation

1798, in the meaning defined at sense 2b

Buying Guide

Our team at The Usage has selected the best beverage cooler of 2021.

Learn More About insulation

Time Traveler for insulation

Time Traveler

The first known use of insulation was in 1798

See more words from the same year

Dictionary Entries Near insulation

insulating varnish


insulation resistance

See More Nearby Entries 

Statistics for insulation

Last Updated

23 Nov 2021

Cite this Entry

“Insulation.” Dictionary, Merriam-Webster, Accessed 4 Dec. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for insulation



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 insulation (audio) \ transitive verb insulated; insulating

More from Merriam-Webster on insulation

Nglish: Translation of insulation for Spanish Speakers

Britannica English: Translation of insulation for Arabic Speakers


Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!