|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|1.||(sometimes functioning as plural) all the persons inhabiting a country, city, or other specified place|
|2.||the number of such inhabitants|
|3.||(sometimes functioning as plural) all the people of a particular race or class in a specific area: the Chinese population of San Francisco|
|4.||the act or process of providing a place with inhabitants; colonization|
|5.||ecology a group of individuals of the same species inhabiting a given area|
|6.||astronomy either of two main groups of stars classified according to age and location. Population I consists of younger metal-rich hot white stars, many occurring in galactic clusters and forming the arms of spiral galaxies. Stars of population II are older, the brightest being red giants, and are found in the centre of spiral and elliptical galaxies in globular clusters|
|7.||statistics Also called: universe the entire finite or infinite aggregate of individuals or items from which samples are drawn|
|population (pŏp'yə-lā'shən) Pronunciation Key
A group of individuals of the same species occupying a particular geographic area. Populations may be relatively small and closed, as on an island or in a valley, or they may be more diffuse and without a clear boundary between them and a neighboring population of the same species. For species that reproduce sexually, the members of a population interbreed either exclusively with members of their own population or, where populations intergrade, to a greater degree than with members of other populations. See also deme.
in human biology, the whole number of inhabitants occupying an area (such as a country or the world) and continually being modified by increases (births and immigrations) and losses (deaths and emigrations). As with any biological population, the size of a human population is limited by the supply of food, the effect of diseases, and other environmental factors. Human populations are further affected by social customs governing reproduction and by the technological developments, especially in medicine and public health, that have reduced mortality and extended the life span.
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