However, based on its root word "diffusion," we can infer some possible meanings:
* Related to diffusion: This could refer to a process or thing that involves diffusion, which is the movement of particles from an area of high concentration to an area of low concentration. This is a common process in physics, chemistry, and biology.
* Spreading or disseminating: "Diffusionary" could be used to describe something that spreads widely and affects many people or things. Think of how ideas or innovations can diffuse through society.
To better understand what "diffusionary" means, please provide more context:
* What sentence or phrase is it used in?
* What is the subject matter?
With more information, I can provide a more accurate explanation.