diffusion
The central image is a gradual, natural outward flow from a concentrated center toward the edges. It describes a process of leveling out or blending until something is evenly distributed. In social and technical contexts, it carries a neutral to positive connotation of progress and accessibility, describing how ideas or innovations "seep" into a population over time. In scientific and artistic contexts, it implies a softening effect. Unlike 'explosion' or 'burst', which are sudden and violent, diffusion is slow, passive, and fluid.
Uncountable when discussing the general scientific process of particles moving or the abstract spreading of ideas. Countable when referring to specific instances, such as different types of 'diffusions' in a chemistry experiment or particular methods of light diffusion in photography.
Meanings
The spreading of something more widely.
"The diffusion of new technology across the globe has accelerated due to the internet."
The process by which molecules move from an area of high concentration to an area of low concentration.
"Diffusion is the primary mechanism by which oxygen enters the bloodstream from the lungs."