Mortality rate (or death rate)
\mɔrˈtæləti\ \reɪt\
Generally, a mortality rate, or death rate, is a measure of the number of deaths in a given population of a given time period. The term is also commonly used by actuaries to refer to the probability of dying within the following year.
For example, the mortality rate for someone aged 70 (exactly) is the probability that he or she will die before they reach their 71st birthday.