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insulation

[in-suh-ley-shuh n, ins-yuh-] /ˌɪn səˈleɪ ʃən, ˌɪns yə-/
noun
1.
material used for insulating.
2.
the act of insulating.
3.
the state of being insulated.
Origin of insulation
1790-1800
1790-1800; insulate + -ion
Related forms
preinsulation, noun
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for insulation

insulation

/ˌɪnsjʊˈleɪʃən/
noun
1.
Also called insulant (ˈɪnsjʊlənt). material used to insulate a body, device, or region
2.
the act or process of insulating
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for insulation
n.

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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