Insulation \In`su*la"tion\, 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]