Webster’s Revised Unabridged Dictionary · 1913
Insulation
In′su·la′tion (·lā′shŭn), n. 1. The act of insulating, or the state of being insulated; detachment from other objects; isolation.
2. (Elec. & Thermotics) The act of separating a body from others by nonconductors, so as to prevent the transfer of electricity or of heat; also, the state of a body so separated.