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[in-suh-ley-shuh n, ins-yuh-] /ˌɪn səˈleɪ ʃən, ˌɪns yə-/
material used for insulating.
the act of insulating.
the state of being insulated.
Origin of insulation
First recorded in 1790-1800; insulate + -ion
Related forms
preinsulation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for insulation
Contemporary Examples
Historical Examples
  • A generator is made of iron, copper, carbon, and insulation.

  • Yet here in the turret, unguarded by insulation, I could say nothing.

  • The insulation is not what keeps the wire cool, as you can see by the next experiment.

    Common Science Carleton W. Washburne
  • The insulation resistance was better than the best known to Earth's science.

    Security Poul William Anderson
  • The insulation of the heavy copper connectors is by means of ebonite.

    On Laboratory Arts Richard Threlfall
  • Inside, Stan knew, lay complex circuitry, traced into the insulation.

    Alarm Clock

    Everett B. Cole
  • Take care that the edges of this hole do not cut the insulation.

    Electric Gas Lighting Norman H. Schneider
British Dictionary definitions for insulation


Also called insulant (ˈɪnsjʊlənt). material used to insulate a body, device, or region
the act or process of insulating
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for insulation

1848, "act of making (something) into an island," noun of action from insulate. Transferred sense attested by 1798. Electrical sense is from 1767. The concrete sense of "insulating material" is recorded by 1870.

Online Etymology Dictionary, © 2010 Douglas Harper
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