Lineage or hereditary derivation.
A particular extension of the idea of gluing.
A falling upon or invasion.
A sloping passage or incline.
A drop to a lower status or condition; decline.
An instance of descending; act of coming down.
A way down.
The condition of being inheritable
The ratio of the genetic variance of a population to its phenotypic variance; i.e. the proportion of variability that is genetic in origin