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Possible definitions for xenography

xerography
Image-forming process that relies on a photoconductive substance whose electrical resistance decreases when light falls on it. Xerography is the basis of the most widely used document-copying machines (see photocopier). The process was invented in the 1930s by U.S. physicist Chester F. Carlson (1906-1968) and developed in the 1940s and '50s by Xerox Corp. (then called Haloid). Light passing through or reflected from a document reaches a selenium-coated drum surface onto which negatively charged particles of ink (toner) are sprayed, forming an image of the document on the drum. As a sheet of paper is passed close to the drum, a positive electric charge under the sheet attracts the negatively charged ink particles, transferring the image to the copy paper. Heat briefly applied fuses the ink particles to the paper. The first commercially successful xerographic copier was introduced in 1959.


demography
Statistical study of human populations, especially with reference to size and density, distribution, and vital statistics. Contemporary demographic concerns include the global "population explosion," the interplay between population and economic development, the effects of birth control, urban congestion, illegal immigration, and labor force statistics. The basis for most demographic research lies in population censuses and the registration of vital statistics.


geography
Science of the earth's surface, which describes and analyzes the spatial variations in physical, biological, and human phenomena that occur on the surface of the globe and treats their interrelationships and their significant regional patterns. Once associated entirely with mapping and the exploration of the earth, the field today is wide-ranging, and geographers use a variety of methods and techniques drawn from numerous disciplines. Subfields of geography include physical, human, and regional geography, which may range in scale from worldwide to a continent, a country, or a city.

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