noun Physics.
the property of a substance indicative of the rate at which a thermal disturbance, as a rise in temperature, will be transmitted through the substance.

1875–80; diffusive + -ity

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World English Dictionary
diffusivity (ˌdɪfjuːˈsɪvɪtɪ)
1.  a measure of the ability of a substance to transmit a difference in temperature; expressed as the thermal conductivity divided by the product of specific heat capacity and density
2.  physics
 a.  the ability of a substance to permit or undergo diffusion
 b.  another name for diffusion coefficient
3.  another name for diffusion

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Example sentences
Conduction tests are used to estimate the formation factor, which can also be related to diffusivity.
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