Diffusion
Definition 1 of 4

Non-physical Spread
Understand that 'diffusion' can describe the spread of intangible things like ideas.

The diffusion of digital literacy is crucial for modern education.
Not Instantaneous
'Diffusion' often implies a gradual process, not something that happens suddenly.

The diffusion of new fashion trends can take years to reach remote areas.
Compare with
circulationdispersiondisseminatorpenetratepermeancepropagatespreadtransmission
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