Statistical term denoting all the objects, events, or subjects in a particular class. Cf.:sample. [L. populus, a people, nation]
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pop·u·la·tion .päp-yə-'lā-shən n
1) the whole number of people or inhabitants in a country or region
2 a) a body of persons or individuals having a quality or characteristic in common
b ) (1) the organisms inhabiting a particular locality (2) a group of interbreeding organisms that represents the level of organization at which speciation begins
3) a group of individual persons, objects, or items from which samples are taken for statistical measurement
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pop·u·la·tion (pop″u-laґshən) [L. populatio, from populus people] 1. the individuals collectively constituting a certain category or inhabiting a specified geographic area. 2. in statistics, a theoretical concept used to describe an entire group or collection of units, finite or infinite; from it a sample can be drawn.Medical dictionary. 2011.