impregnation

noun4

1. •
   The act of making pregnant; fertilization.
2. •
   The fact or process of imbuing or saturating with something; diffusion of some element, idea etc. through a medium or substance.

   • Earths and alkalies are simply metallic oxides; whilst a farther impregnation of these substances with oxygen produces an acid.... — 1846
3. •
   That with which anything is impregnated.
4. •
   An ore deposit, with indefinite boundaries, consisting of rock impregnated with ore.