Fecundity, derived from the word, generally refers to the ability to reproduce. In biology and demography, fecundity's the potential reproductive capacity of an organism or population, measured by the number of gametes (eggs), seed set or asexual propagules. Fecundity's under both genetic and environmental control, and's the major measure of fitness. Fecundation's another term for fertilisation. Superfecundity refers to an organism's ability to store another organism's sperm (after copulation) a… (More on Fecundity)