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Definition of Diffusion

Babylon English Dictionary

distribution, dispersion, scattering; permeation of a region by fluid
Diffusion Definition from Arts & Humanities Dictionaries & Glossaries
Glossary of Technical Theatre Terms
A diffusing filter used to soften the edges of a light beam. Different strengths of diffuser are available from many colour filter manufacturers. See silk.
Jon Primrose
Diffusion Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
The act of passing by osmosis through animal membranes, as in the distribution of poisons, gases, etc., through the body. Unlike absorption, diffusion may go on after death, that is, after the blood ceases to circulate.
  
(n.)
The act of diffusing, or the state of being diffused; a spreading; extension; dissemination; circulation; dispersion.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

diffusion
\dif*fu"sion\ (?), n. [l. diffusio: cf. f. diffusion.]
1. the act of diffusing, or the state of being diffused; a spreading; extension; dissemination; circulation; dispersion. a diffusion of knowledge which has undermined superstition.
2. (physiol.) the act of passing by osmosis through animal membranes, as in the distribution of poisons, gases, etc., through the body. unlike absorption, diffusion may go on after death, that is, after the blood ceases to circulate.

for Vocabulary Exams of KPDS, YDS,UDS (in Turkey); and SAT in America
Dispersion
JM Welsh <=> English Dictionary
Rhaf = n. a spread, a diffusion
Sewyd = n. diffusion of stars
WordNet 2.0

Noun
1. (physics) the process of diffusing; the intermingling of molecules in gases and liquids as a result of random thermal agitation
(hypernym) natural process, natural action, action, activity
(hyponym) osmosis
(classification) physics, physical science, natural philosophy
2. the spread of social institutions (and myths and skills) from one society to another
(hypernym) spread, spreading
(classification) mythology
3. the property of being diffused or dispersed
(synonym) dissemination
(hypernym) distribution, dispersion
4. the act of dispersing or diffusing something; "the dispersion of the troops"; "the diffusion of knowledge"
(synonym) dispersion, dispersal, dissemination
(hypernym) spread, spreading
(hyponym) crop-dusting, spraying
(derivation) diffuse, spread, spread out, fan out
Diffusion Definition from Business & Finance Dictionaries & Glossaries
Raynet Business & Marketing Glossary
the time rate at which new products move through various adoption categories (innovators, early adopters, early majority, late majority, laggards).
Copyright © 2001, Ray Wright
Diffusion Definition from Social Science Dictionaries & Glossaries
Glossary of Sociology
The spread of cultural traits from one sociocultural system to another.
Diffusion Definition from Science & Technology Dictionaries & Glossaries
BioProcess International™ Glossary
the process by which two fluids or solutions disperse and mix when put together in a single area because of random movement of molecules by intermolecular collision.
Copyright © 2002 - 2006, BioProcess International™. All rights reserved.
Glossary of Marine Biology
The net movement of units of a substance from areas of higher concentration
Electrochemistry Dictionary
"The movement of chemical species (ions or molecules ) under the influence of concentration difference. The species will move from the high concentration area to the low concentration area till the concentration is uniform in the whole phase. Diffusion in solutions is the most important phenomenon in electrochemistry, but diffusion will occur also in gases and solids. The rate of diffusion (diffusional flux) is proportional to the gradient of the concentration in the solution, with the proportionality constant called the ""diffusion coefficient."" "
General Chemistry Glossary
 Say it 
Compare with effusion .The mixing of two substances caused by random molecular motions. Gases diffuse very quickly; liquids diffuse much more slowly, and solids diffuse at very slow (but often measurable) rates. Molecular collisions make diffusion slower in liquids and solids.
Agricultural Glossary/yigini2004
The random movement of atoms, molecules or ions due to thermal excitation. Can occur in gases and solutions.
Electronics Terminology
A material transport phenomena that occurs in solids, and is caused by the continual physical motion of atoms from one position to another. This results in the flow of material from regions of high concentraion to regions of low concentration.
Web Dictionary of Cybernetics and Systems
the spread of an idea, product or process beyond first use. (Umpleby )

Dictionary of Automotive Terms
the way in which innovations spread through market or non-market channels.
Rubber Glossary
The mixing of two or more substances (solids, liquids, gasses, or combinations thereof) due to the intermingling motion of their individual molecules. Gasses diffuse more readily than solids.
Materials Science and Engineering Glossary of Terms
motion of atoms, ions, or vacancies through a material.
AJA_Glossary of Wireless, RF and Microwave Terms
The phenomenon of movement of matter at the atomic level from regions of high concentration to regions of low concentration.
Diffusion Definition from Computer & Internet Dictionaries & Glossaries
Integrated Circuit Terminology
a process whereby a substance redistributes from an area of relatively high concentration to an area of relatively low concentration due to random thermal motion. The larger the concentration gradient the faster diffusion occurs for a given temperature, conversely, the higher the temperature the faster diffusion occurs for a given concentration gradient.
Copyright © 2000 - 2006 IC Knowledge LLC. All rights reserved.
Glossary of the European Information Society
Making information available to a wider audience about the work and outcome of a project with the aim of increasing the speed of uptake of its results.
© European Communities, 1995-2004
Sound Escape Glossary of Terms
The scattering of sound. Diffusion reduces the sense of direction of a sound source, a useful quality in surround speakers.
Diffusion Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport, without requiring bulk motion. Thus, diffusion should not be confused with convection, or advection, which are other transport mechanisms that utilize bulk motion to move particles from one place to another. In Latin, "diffundere" means "to spread out".

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Diffusion Definition from Society & Culture Dictionaries & Glossaries
EPA Terms of Environment
The movement of suspended or dissolved particles (or molecules) from a more concentrated to a less concentrated area. The process tends to distribute the particles or molecules more uniformly.
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering (English ver.)
The movement of suspended or dissolved particles (or molecules) from a more concentrated to a less concentrated area. The process tends to distribute the particles or molecules more uniformly.
Diffusion Definition from Entertainment & Music Dictionaries & Glossaries
Guitar Glossary
An even distribution of sound in a room.
Copyright © 1996-2006 Guitar Nine Records All Rights Reserved.
English to Federation-Standard Golic Vulcan
sasak
Diffusion Definition from Medicine Dictionaries & Glossaries
TOXICOLOGY
The spontaneous movement of a substance from a high concentration gradient to a lower concentration gradient.
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Hepatitis Central (TM) Liver Disease Medical Glossary
Spreading
To spread out evenly, as in a liquid