1. the total number of persons inhabiting a country, city, or any district or area.
2. the body of inhabitants of a place: The population of the city opposes the addition of fluorides to the drinking water.
3. the number or body of inhabitants of a particular race or class in a place: the native population; the working-class population.
4. Statistics. any finite or infinite aggregation of individuals, not necessarily animate, subject to a statistical study.
5. Ecology. a. the assemblage of a specific type of organism living in a given area.
b. all the individuals of one species in a given area.

6. the act or process of populating: Population of the interior was hampered by dense jungles.