<unk>  derives from “hysteresis”, meaning “lag”. It is the tendency to react slowly to an outside force, or to not return completely to its original state. Whereas the area within a hysteresis loop represents energy dissipated to heat and is an extensive quantity with units of energy, the<unk>  represents the fraction of the elastic energy that is lost to heat, and is an intensive property that is dimensionless.
Hysteresivity
Expressivity 
Neurodiversity
Variegation 
Codependency
Hypofrontality
Stereotypy
Delayed milestone