GNU Collaborative International Dictionary of English
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Found one definition
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Insulation (?), n.
1. The act of insulating, or the state of being insulated; detachment from other objects; isolation.
[1913 Webster]
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.
[1913 Webster]
3. The material or substance used to insulate from either electrical or thermal conduction; as, “fiberglass is used as thermal insulation in the walls and roofs of houses”.
[Webster 1913 Suppl. +PJC]