diffusion
nounUK /dɪˈfjuːʒn/
US /dɪˈfjuːʒən/
Diffusion is when something spreads out slowly and mixes with everything around it.
The smell of fresh cookies spread through the house by diffusion.
OTHER MEANINGS
2. The process in which particles move from an area where there are many of them to an area where there are fewer.
In science class, we watched a drop of ink diffuse through water.
3. The spreading of ideas, knowledge, or culture from one group or place to another.
The diffusion of new music styles happens quickly online.
4. A soft, gentle light that spreads evenly rather than coming from one sharp point.
The lamp gave a warm diffusion of light across the room.