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Meaning of diffusivity

dif•fu•siv•i•ty

Pronunciation: (dif"yoo-siv'i-tē), [key]
— n. Physics.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.