|Origin:||diffuser, from Latin diffusus, past participle of diffundere 'to spread out'|
1 [intransitive and transitive]
to make heat, light, liquid etc spread through something, or to spread like this
The pollutants diffuse into the soil.
2 [intransitive and transitive]
to spread ideas or information among a lot of people, or to spread like this:
Their ideas diffused quickly across Europe.
to make a bad feeling or situation less strong or serious:
an attempt to diffuse his anger
—diffusion noun [uncountable]