Definitions for "Heterozygosity"
the average proportion of loci at which an individual in a population is heterozygous.
genetic variability among individuals within populations and variability among populations.
A measure of genetic variation in a population calculated either as the mean frequency of heterozygotes over all loci (observed heterozygosity), or as the mean frequency of heterozygotes expected in a population in Hardy-Weinberg equilibrium (expected heterozygosity or gene diversity).