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thermal conductivity. n. 1. (General Physics) a measure of the ability of a substance to conduct heat, determined by the rate of heat flow normally through an area in the substance divided by the area and by minus the component of the temperature gradient in the direction of flow: measured in watts per metre per kelvin.
weather verb (AIR CONDITIONS) âº [ I/T ] to change in color or form over a period of time because of the effects of sun, wind, rain, or other conditions in the air: [ I ] The yellow paint will weather to a grayish white.