the science of vital and social statistics, as of the births, deaths, diseases, marriages, etc., of populations.

1875–80; demo- + -graphy

demographer, demographist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
demography (dɪˈmɒɡrəfɪ)
the scientific study of human populations, esp with reference to their size, structure, and distribution
[C19: from French démographie, from Greek dēmos the populace; see -graphy]

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Word Origin & History

1880, from Gk. demos "people" (see demotic) + English -graphy "the study of," from Gk. -graphia "description," from graphein "to write" (about).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

demography de·mog·ra·phy (dĭ-mŏg'rə-fē)
The study of the characteristics of human populations, such as size, growth, density, distribution, and vital statistics.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
demography [(di-mog-ruh-fee)]

The quantitative study of human populations. Demographers study subjects such as the geographical distribution of people, birth and death rates, socioeconomic status, and age and sex distributions in order to identify the influences on population growth, structure, and development.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
For a college admissions officer, demography is destiny.
Market research demography is a creativity buzz kill.
Texts on world demography risk being every bit as dry as the numbers underlying
  explosive population growth.
Check the demography of developed contries.
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