Population

1. In statistics the total count of subjects in a census, sample or survey in its entirety, or the count in reference to a particular context, e.g., the number of respondents to a question.

2. In demographics, the count of people in any geographical area or any classification, for example, age, sex, marital status, ethnic origin, etc.

3. In ecology and genetics, over a period of time, the total number of individuals of a single species, or the number in a particular space. This applies to microorganisms, insects, plants and animals, as well as man.