- verb to fill something with a substance by passing it inside through the outer surface
- verb to fertilise a female, by introducing male spermatozoa into the female’s body so that they fuse with the female’s ova
- To fill throughout, permeate, or saturate one substance with another. For instance, to use diffusion to uniformly distribute a gaseous dopant within the crystal lattice of a semiconductor material.
- verb to soak a cloth with a liquid