Meaning of impregnation

(noun) material with which something is impregnated; "the impregnation, whatever it was, had turned the rock blue"

the process of totally saturating something with a substance; "the impregnation of wood with preservative"; "the saturation of cotton with ether"

creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant