say it: mawr-TAL-uh-tee
mortality is a noun meaning "the quality or state of being mortal". It carries 2 recorded senses.
the quality or state of being mortal
the ratio of deaths in an area to the population of that area; expressed per 1000 per year
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for mortality come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.