1) Individuals classified according to their sex, racial origin, religion, common place of living, financial or social status, or some other cultural or behavioural attribute. (UMLS, 2003)

2) A group of individuals united by a common factor (e.g., geographic location, ethnicity, disease, age, gender)

3) The whole number of people or inhabitants in a country or region.

4) A body of persons or individuals having a quality or characteristic in common.

5) The organisms inhabiting a particular locality.

6) A group of interbreeding organisms that represents the level of organisation at which speciation begins.

7) A group of individual persons, objects, or items from which samples are taken for statistical measurement.