Population density


the number of people living per unit of an area (e.g. per square mile); the number of people relative to the space occupied by them


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    noun the arrangement or spread of people living in a given area; also, how the population of an area is arranged according to variables such as age, race, or sex

  • Population-explosion

    noun 1. the rapid increase in numbers of a particular species, especially in the world’s human population since the end of World War II, attributed to an accelerating birthrate, a decrease in infant mortality, and an increase in life expectancy. noun 1. a rapid increase in the size of a population caused by such factors […]

  • Population-genetics

    noun 1. the branch of genetics concerned with the hereditary makeup of populations. 2. the study of changes in gene frequencies in population of organisms and the effects of such changes on evolution and adaptation. population genetics n. The branch of genetics that deals with the genetic makeup of populations. population genetics The scientific study […]

  • Population-inversion

    noun, Physics. 1. a condition of matter in which more electrons are in a high energy state than in a lower energy state, as is required for the operation of a laser. population inversion The condition of having enough excited or high-energy states distributed in a material that a chain-reaction of stimulated emission can occur. […]

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