Etymology
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demography (n.)

"that branch of anthropology which studies life-conditions of a people by its vital and social statistics," 1880, from Greek dēmos "people" (see demotic) + -graphy.

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demographics (n.)
1967, the science of divining from demographic statistics; see demography + -ics. Originally in reference to TV audiences and advertisers.
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demographic (adj.)

1882, "of or pertaining to demography," from demography + -ic. As a noun, by 1998, short for demographic group or category. Related: Demographical; demographically; demographer (1877).

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*da- 

*dā-, Proto-Indo-European root meaning "to divide."

It forms all or part of: betide; daimon; Damocles; deal (v.); deal (n.1) "part, portion;" demagogue; demiurge; democracy; demography; demon; demotic; dole; endemic; epidemic; eudaemonic; geodesic; geodesy; ordeal; pandemic; pandemonium; tidal; tide (n.) "rise and fall of the sea;" tidings; tidy; time; zeitgeist.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dati "cuts, divides;" Greek dēmos "people, land," perhaps literally "division of society," daiesthai "to divide;" Old Irish dam "troop, company;" Old English tid "point or portion of time," German Zeit "time."

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