from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The process of diffusing or the condition of being diffused.
- noun The scattering of incident light by reflection from a rough surface.
- noun The transmission of light through a translucent material.
- noun The spontaneous intermingling of the particles of two or more substances as a result of random thermal motion.
- noun The spread of linguistic or cultural practices or innovations within a community or from one community to another.
from The Century Dictionary.
- noun The act of diffusing, or the state of being diffused.
- noun A scattering, dispersion, or dissemination, as of dust or seed, or of animals or plants.
- noun Propagation or spread, as of knowledge or doctrine.
- noun Diffuseness; prolixity.
- noun Conduction of heat.
- noun Synonyms Spread, circulation, expansion, dissemination, distribution.
- noun In psychology, the law, formulated by A. Bain, that “according as an impression is accompanied with feeling, the aroused currents diffuse themselves freely over the brain, leading to a general agitation of the moving organs, as well as affecting the viscera.”
from the GNU version of the Collaborative International Dictionary of English.
- noun The act of diffusing, or the state of being diffused; a spreading; extension; dissemination; circulation; dispersion.
- noun (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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun the act of
diffusingor dispersingsomething, or the property of being diffusedor dispersed; dispersion
- noun physics the
scatteringof lightby reflectionfrom a rough surface, or by passagethrough a translucent medium
- noun physics the
interminglingof the moleculesof a fluiddue to random thermal agitation
- noun the
spreadof culturalor linguisticpractices, or social institutions, in one or more communities
- noun physics, weather
Exchangeof airborne mediabetween regionsin spacein an apparently randommotion of a small scale.
- noun the
movementof water vaporfrom regions of high concentration(high water vapor pressure) toward regions of lower concentration.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the spread of social institutions (and myths and skills) from one society to another
- noun (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration
- noun the property of being diffused or dispersed
- noun the act of dispersing or diffusing something
from Wiktionary, Creative Commons Attribution/Share-Alike License
The term diffusion applies both to dissemination of information about a new technology and dissemination of the technology itself; for instance, new cooking stoves.
I like to use reflected light as much as possible, and the source can be anything as long as the angle and diffusion is good.
Random diffusion is a type of stochastic process, so if the theory of cosmogenic drift is to be developed, and if observable predictions are to be derived from it, then it will be necessary to employ the mathematics of stochastic processes.
The simplest type of diffusion is Brownian motion, (also termed a Wiener process), which is a simple random walk in which the increments between random variables St have a normal distribution with a mean value of zero.
An ID proponent, citing Dembski in No Free Lunch, insists that diffusion is not possible inside of living cells.
There is a need to anticipate technical characteristics - such as performance, cost, and diffusion - of new energy technologies such as photovoltaics, hydrogen production, and fuel cells; the long-term diffusion, transfer, and performance of these technologies depends on near-term RD&D and investment policies and decisions.
The rate of diffusion is determined by the difference between the tension in the blood and that in the surrounding tissue.
We have direct evidence that only a small part of the acetylcholine so injected actually reaches the muscle end plates by diffusion from the vessels; and we argued that, in any case, it could not reach them simultaneously, but only in rapid succession; so that the response, in spite of its superficial resemblance to a rather slow twitch, must actually be
Thus Jefferson's early, eloquent denunciations of slavery (whether sincere or half-hearted) gave way to cheerleading for what he called "diffusion" -- the proposition that, if slavery were expanded into the western territories, it would somehow dilute itself and go away, never mind the cost to its victims in the meantime.
Considering the manner in which acetylcholine must reach the motor end plates of the muscle fibres, if it were indeed the transmitter of motor nerve excitation - that it must appear with a flash-like suddenness, in high concentration, simultaneously at every nerve ending - we concluded that the ordinary method of injecting acerylcholine, so that it reached the muscle by slow diffusion from the general circulation, could not possibly reproduce this abrupt appearance at the points responsive to its action.