Emily Dickinson Lexicon

DIF-FU'SION, n. [s as z.]

1. A spreading or flowing of a liquid substance or fluid, in a lateral as well as a lineal direction; as, the diffusion of water; the diffusion of air or light.
2. A spreading or scattering; dispersion; as, a diffusion of dust or of seeds.
3. A spreading; extension; propagation; as, the diffusion of knowledge, or of good principles.
4. Copiousness; exuberance, as of style. [Little used.]