nontwin

Nontwin is a term used to describe individuals who are not part of a twin pregnancy. This can refer to the majority of the population, as twin births are less common than single births. The term is often used in contrast to "twin," specifically to distinguish someone who was not conceived or born as part of a pair of twins. In biological and medical contexts, understanding the distinction between singleton and twin pregnancies is important for various reasons, including prenatal care, developmental studies, and genetic research. While twins share a unique biological relationship, nontwins have a standard developmental trajectory as single offspring. The concept of being a nontwin is the default human experience, with twins being a specific variation.