- act of diffusing; state of being diffused.
- prolixity of speech or writing; discursiveness.
- Also called migration.an intermingling of molecules, ions, etc., resulting from random thermal agitation, as in the dispersion of a vapor in air.
- a reflection or refraction of light or other electromagnetic radiation from an irregular surface or an erratic dispersion through a surface; scattering.
- Movies. a soft-focus effect resulting from placing a gelatin or silk plate in front of a studio light or a camera lens, or through the use of diffusion filters.
- Meteorology. the spreading of atmospheric constituents or properties by turbulent motion as well as molecular motion of the air.
- Anthropology, Sociology. Also called cultural diffusion. the transmission of elements or features of one culture to another.
Origin of diffusion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- the act or process of diffusing or being diffused; dispersion
- the random thermal motion of atoms, molecules, clusters of atoms, etc, in gases, liquids, and some solids
- the transfer of atoms or molecules by their random motion from one part of a medium to another
- physics the transmission or reflection of electromagnetic radiation, esp light, in which the radiation is scattered in many directions and not directly reflected or refracted; scattering
- Also called: diffusivity physics the degree to which the directions of propagation of reverberant sound waves differ from point to point in an enclosure
- anthropol the transmission of social institutions, skills, and myths from one culture to another
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
Word Origin and History for self-diffusion
Online Etymology Dictionary, © 2010 Douglas Harper
- The process of diffusing or the condition of being diffused.
- The spontaneous intermingling of the particles of two or more substances as a result of random thermal motion.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
- The movement of atoms or molecules from an area of higher concentration to an area of lower concentration. Atoms and small molecules can move across a cell membrane by diffusion. Compare osmosis.
- The reflection or refraction of radiation such as light or sound by an irregular surface, tending to scatter it in many directions.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.