noun (n)

• material with which something is impregnated(noun.substance)

  Example:
  The impregnation, whatever it was, had turned the rock blue.
  

  source: wordnet30
• the process of totally saturating something with a substance(noun.process)

  Example:
  The impregnation of wood with preservative.
  

  Synonym:
  saturation
  

  source: wordnet30
• 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.event)

  Synonym:
  fecundation, fertilisation, fertilization
  

  source: wordnet30
• The act of impregnating or the state of being impregnated; fecundation.(noun)

  source: webster1913