n. The ratio of the genetic variance of a population to its phenotypic variance; i.e. the proportion of variability that is genetic in origin
the GNU version of the Collaborative International Dictionary of English
n. The state of being heritable.
The Century Dictionary and Cyclopedia
n. The state or quality of being heritable.
Word Usage
"Others, such as David Goldstein of Duke University, think that heritability is hiding in rare genetic variants, not common ones — in "private mutations," genetic peculiarities that are shared by just a few people each."