The particular demographic makeup of a population.
The study of the structure and population dynamics of other lifeforms, such as mammals, insects, plants, etc.
The study of the characteristics of human populations, especially with regards to their makeup and fluctuations and the social causes behind these.
A systematic collection of data on measurements or observations, often related to demographic information such as population counts, incomes, population counts at different ages, etc.
A discipline, principally within applied mathematics, concerned with the systematic study of the collection, presentation, analysis, and interpretation of data.