emotional result we call happiness, most of us tend to engage in behaviour that is the exact opposite and then feel awful and inadequate with the inevitable result.
A subcategory within a particular genre: The academic mystery is a subgenre of the mystery novel. subcategory within a particular genre: The academic mystery is a subgenre of the mystery novel.
Sub-populations existing in a First World country, but with the living standards of those of a Third World, or developing country. The term is not commonly accepted and Fourth World has also been used to refer to other parts of the world in relation to the Three-World Model.