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double fertilization
This term is a specialized botanical concept used almost exclusively in academic, scientific, and educational contexts. It describes a unique reproductive mechanism that distinguishes angiosperms (flowering plants) from gymnosperms. The term carries a neutral, descriptive tone and is used to explain the simultaneous creation of both the embryo and the nutrient-providing endosperm.
Because this is a technical biological process, it is treated as an uncountable noun. It refers to a specific phenomenon rather than a discrete object that can be counted. You would refer to "the process of double fertilization" rather than "a double fertilization" in most scientific literature.
Meanings
A complex process in angiosperms where two sperm cells from a single pollen grain enter the ovule; one fuses with the egg cell to form a zygote, and the other fuses with two polar nuclei to form the endosperm.
The development of the seed in flowering plants is made possible by double fertilization.