populations
n. countablen. all the people or animals of a particular type living in a specific area. You use this when talking about how many individuals are in a city, country, or group.
n. the total number of inhabitants in a given area, or a specific group of individuals within a larger set. Often used in plural form to distinguish between different demographic or biological groups.
The populations of many large cities are growing rapidly.
Scientists are studying the local bird populations to see how the new park affects their nesting habits.
Public health initiatives must account for the diverse needs of urban populations, particularly those with limited access to primary care facilities and affordable nutrition.
While the singular form refers to a total count, the plural 'populations' specifically refers to multiple distinct groups or ethnic sets.