Etymology
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mortality (n.)

mid-14c., mortalite, "condition of being subject to death or the necessity of dying," from Old French mortalite "massacre, slaughter; fatal illness; poverty; destruction" (12c.) and directly from Latin mortalitem (nominative mortalitas) "state of being mortal; subjection to death," from mortalis "subject to death, mortal," from PIE root *mer- "to rub away, harm" (also "to die" and forming words referring to death and to beings subject to death).

Meaning "widespread death, numerousness of deaths; plague" is from c. 1400; meaning "number of deaths from some cause or in a given period" is from 1640s, later especially in proportion to population.

Entries linking to mortality

*mer- 

Proto-Indo-European root meaning "to rub away, harm." Possibly identical with the root *mer- that means "to die" and forms words referring to death and to beings subject to death.

It forms all or part of: amaranth; ambrosia; amortize; Amritsar; immortal; manticore; marasmus; mare (n.3) "night-goblin, incubus;" morbid; mordacious; mordant; moribund; morsel; mort (n.2) "note sounded on a horn at the death of the quarry;" mortal; mortality; mortar; mortgage; mortify; mortmain; mortuary; murder; murrain; nightmare; post-mortem; remorse.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit mrnati "crushes, bruises," mriyate "to kill," martave "to die," mrta- "died, dead," mrtih "death," martah "mortal man," amrta- "immortal;" Avestan miriia- "to die," miryeite "dies," Old Persian martiya- "man;" Hittite mer- "to disappear, vanish," marnu- "to make disappear;" Armenian meranim "to die;" Greek marainein "to consume, exhaust, put out, quench," marasmus "consumption," emorten "died," brotos "mortal" (hence ambrotos "immortal"); Latin mors (genitive mortis) "death," mori "to die;" Armenian merani- "to die;" Gothic maurþr, Old English morþ "murder;" Old Irish marb, Welsh marw "dead;" Lithuanian mirti "to die," mirtis "death;" Old Church Slavonic mreti "to die," mrutvu "dead;" Russian mertvyj, Serbo-Croatian mrtav "dead."

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Definitions of mortality

mortality (n.)
the quality or state of being mortal;
mortality (n.)
the ratio of deaths in an area to the population of that area; expressed per 1000 per year;
Synonyms: deathrate / death rate / mortality rate / fatality rate
From wordnet.princeton.edu

Dictionary entries near mortality

morrow

Morse code

morsel

mort

mortal

mortality

mortally

mortar

mortarboard

mortgage

mortgagee

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