The term “development” in international parlance therefore encompasses the need and the means by which to provide better lives for people in poor countries. It includes not only economic growth, although that is crucial, but also human development—providing for health, nutrition, education, and a clean environment.developmental biology definition. The study of the processes by which an organism develops from a zygote to its full structure. This field includes the study of cellular differentiation as well as body structure development. (See also embryology.) Economic development is the sustained, concerted actions of policy makers and communities that promote the standard of living and economic health of a specific area. Economic development can also be referred to as the quantitative and qualitative changes in the economy.