Also means
diffusion (physics/chemistry)
Usage Note
Diffusion covers media broadcasting (diffusion en direct — live broadcast), the spread of ideas, and the physical process of diffusion in science. Une émission en diffusion is a programme on air. The verb is diffuser; a broadcaster is un diffuseur.
Examples
"La diffusion de l'émission commence à vingt heures."
Natural Translation
The broadcast of the programme starts at eight o'clock.
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