fertilization

1. The act or process of rendering fertile. (countable, uncountable)
2. The act of fecundating or impregnating the gametes of animals, plants, etc.; including the process by which in flowers the pollen renders the ovule fertile, an analogous process in flowerless plants, or the joining of sperm and egg in animals. (countable, uncountable)
3. The act of applying fertilizer to soil. (countable, uncountable)

Plural fertilizations