GNU Collaborative International Dictionary of English

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  1.       
    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]

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