diffusion

Borrowed from Latin diffusionem (accusative of diffusio), from verb diffundere; can be decomposed as diffuse +‎ -ion.

• (UK) IPA^(key): /dɪˈfjuːʒən/
• Rhymes: -uːʒən

diffusion (countable and uncountable, plural diffusions)

1. The act of diffusing or dispersing something, or the property of being diffused or dispersed; dispersion.
2. (physics) The scattering of light by reflection from a rough surface, or by passage through a translucent medium.
3. (physics) The intermingling of the molecules of a fluid due to random thermal agitation.
4. The spread of cultural or linguistic practices, or social institutions, in one or more communities.
5. (physics, weather) Exchange of airborne media between regions in space in an apparently random motion of a small scale.
6. The movement of water vapor from regions of high concentration (high water vapor pressure) toward regions of lower concentration.

• diffuser

Borrowed from Latin diffusio, diffusionem. Synchronically analysable as diffuser +‎ -ion.

diffusion f (plural diffusions)

1. broadcasting, showing
2. dissemination, diffusion (of culture, knowledge, etc.)
3. circulation (of a news medium)
4. (physics) diffusion

• diffus
• diffuser

• émission

• “diffusion” in le Trésor de la langue française informatisé (The Digitized Treasury of the French Language).