[ dif-yoo-siv-i-tee ]
/ ˌdɪf yʊˈsɪv ɪ ti /

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.

Origin of diffusivity

First recorded in 1875–80; diffusive + -ity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for diffusivity

  • Taking a foot as the unit of length, and a year as the unit of time, we find the diffusivity of the surface strata to be 400.

    Lord Kelvin|Andrew Gray

British Dictionary definitions for diffusivity


/ (ˌdɪfjuːˈsɪvɪtɪ) /


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
  1. the ability of a substance to permit or undergo diffusion
  2. another name for diffusion coefficient
another name for diffusion (def. 5)

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012