Fertilization

The act or process of rendering fertile.

The act of fecundating or impregnating animal or vegetable germs; esp., the process by which in flowers the pollen renders the ovule fertile, or an analogous process in flowerless plants; fecundation; impregnation.

The union of male and female gametes to form a zygote

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