mor·tal·i·ty

[mawr-tal-i-tee]
noun, plural mor·tal·i·ties.
1.
the state or condition of being subject to death; mortal character, nature, or existence.
2.
the relative frequency of deaths in a specific population; death rate.
3.
mortal beings collectively; humanity.
4.
death or destruction on a large scale, as from war, plague, or famine.
5.
Obsolete, death.

Origin:
1300–50; Middle English mortalite < Middle French < Latin mortālitās. See mortal, -ity

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Mortality is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
Collins
World English Dictionary
mortality (mɔːˈtælɪtɪ) [Click for IPA pronunciation guide]
 
n , pl -ties
1.  the condition of being mortal
2.  great loss of life, as in war or disaster
3.  the number of deaths in a given period
4.  mankind; humanity
5.  an obsolete word for death

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

mortality
mid-14c., "condition of being mortal," from Fr. mortalité (12c.), from L. mortalitem, from mortalis (see mortal). Meaning "widespread death" is from c.1400; meaning "number of deaths from some cause or in a given period" is from 1640s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mortality mor·tal·i·ty (môr-tāl'ĭ-tē)
n.

  1. The quality or condition of being mortal.

  2. Death rate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

mortality

in demographic usage, the frequency of death in a population

Learn more about mortality with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The general announcement traditionally comes with the birth itself, sadly
  because of the high mortality rates of old.
Now two actuaries have diverted their attention from falling mortality rates to
  devise a system that eliminates this perversity.
The writer realized that in the extinction of any species there was a guarantee
  of our own mortality.
If you take it far enough, the personal threats of aging and mortality provide
  the starkest call among human females to reproduce.
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