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

    Synonym: fertilizationfertilisationfecundation

2. the process of totally saturating something with a substance

    e.g. the impregnation of wood with preservative
           the saturation of cotton with ether

    Synonym: saturation

3. material with which something is impregnated

    e.g. the impregnation, whatever it was, had turned the rock blue