(economics) The concept that the relationship between the rich and the poor countries is just a global version of the dualism that we see in every aspect of life; a concept that in interrelations the superior elements do little or nothing to pull up the inferior elements, and may serve to push them down.

(psychology) The progressive evolution of infantile sexuality through oral, anal, phallic, latent, and genital phases.

plural of sustainable development

(agriculture, ecology) Development which seeks to produce sustainable economic growth while ensuring future generations' ability to do the same by not exceeding the regenerative capacity of nature.

plural of Millennium Development Goal

A concept developed by Soviet psychologist and social constructivist Lev Vygotsky: the difference between what a learner can do without help and what he or she can do with help.

(software engineering) A software development process that relies on the repetition of a minimal development cycle where the developer writes an (initially failing) automated test case that defines a desired improvement or new function, then produces the minimum amount of code to pass that test, and finally refactors the new code to acceptable standards.

(historical) Any of a set of eight international development goals established by the United Nations in 2000, scheduled to be achieved by 2015.

plural of disorder of sex development

A medical condition whereby the development of chromosomal or anatomical sex is in some way atypical; an intersex condition.