Carrying Capacity The maximum sustainable size of a resident population in a given ecosystem.

Census A canvass of a given area, resulting in an enumeration of the entire population and often the compilation of other demographic, social, and economic information pertaining to that population at a specific time.

Childbearing Years The reproductive age span of women, assumed for statistical purposes to be 15-44 or 15-49 years of age.

Cohort A group of people sharing a common temporal demographic experience who are observed through time. For example, the birth cohort of 1900 is the people born in that year. There are also marriage cohorts, school class cohorts, and so forth.

Completed Fertility Rate The number of children born per woman to a cohort of women by the end of their childbearing years.

Contraceptive prevalence Percentage of couples currently using a contraceptive method.

Crude Rate Rate of any demographic event computed for an entire population.