• synonyms


[in-suh-ley-shuh n, ins-yuh-]
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  1. material used for insulating.
  2. the act of insulating.
  3. the state of being insulated.
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Origin of insulation

First recorded in 1790–1800; insulate + -ion
Related formspre·in·su·la·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for insulation


  1. Also called: insulant (ˈɪnsjʊlənt) material used to insulate a body, device, or region
  2. the act or process of insulating
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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

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.

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Online Etymology Dictionary, © 2010 Douglas Harper