Which term describes the number of emigrants departing an area of origin?

The term that describes the number of emigrants departing an area of origin is the emigration rate. This rate specifically focuses on individuals who leave a particular geographic location to settle elsewhere. Understanding the emigration rate is crucial because it provides insight into population dynamics, labor force changes, and can affect economic and social conditions in the area of origin.

In contrast, immigration rate pertains to the influx of individuals arriving into a region from elsewhere, which is not the focus of this question. Net migration captures the balance between the number of people entering and leaving an area, thus including both immigration and emigration, but it does not specifically denote the number of emigrants. The census rate is generally related to the systematic collection and analysis of data concerning a population, which does not specifically deal with the movement of people across borders.