Definition of "Impregnation" :
noun: creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant
noun: the process of totally saturating something with a substance
"The impregnation of wood with preservative."
noun: material with which something is impregnated
"The impregnation, whatever it was, had turned the rock blue."