Simultaneity's the property of two events happening at the same time in at least one reference frame. The noun Simult means a supernatural coincidence, two or more divinely inspired events that occur at or near the same period of time that're related to each other in both noticeable and unnoticeable characteristics [Latinsimul, at the same time; see sem-1 in Indo-European Roots + English -taneous(as in instantaneous). In econometrics, it arises when one or more of the explanatory variables's joi… (More on Simultaneity)