Diffusivity
The Century Dictionary and Cyclopedia
noun.
Specifically, in
physical
, a physical constant expressing the rate of diffusion of a dissolved substance in the solvent.
noun.
The power or rate of diffusion.
the GNU version of the Collaborative International Dictionary of English
noun.
Tendency to become diffused; tendency, as of heat, to become equalized by spreading through a conducting medium.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A tendency to
diffuse
noun.
a
coefficient
of
diffusion
; especially the amount of
heat
that passes through a given
area
in unit
time