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.

Nearby words

  1. diffusion hypoxia,
  2. diffusion line,
  3. diffusion respiration,
  4. diffusionism,
  5. diffusive,
  6. diffusor,
  7. diflorasone diacetate,
  8. difluence,
  9. diflunisal,
  10. difunctional

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



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