survivorship

Noun

 * 1) The state of being a survivor.
 * 2)  The number or percentage of young that survive to adulthood.
 * 3)  A right whereby a person becomes entitled to property by reason of his having survived another person who had an interest in it. It is one of the elements of a joint tenancy.

Derived terms

 * survivorship bias
 * presumption of survivorship