What is the meaning of impregnation?

noun

• Material with which something is impregnated.
  • usage: "the impregnation, whatever it was, had turned the rock blue"
• The process of totally saturating something with a substance.
  • usage: "the impregnation of wood with preservative"; "the saturation of cotton with ether"
  • synonyms: saturation
• Creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant.
  • synonyms: fertilization, fertilisation, fecundation