Empiricity arises when a representation is the result of observations and not, for example, of a thought experiment. Furthermore, the concept of property measured must be based on empirically determinable relations and not, say, on convention” convention (Finkelstein 2003).
There is empiricity when the relations among the observed objects are “real” and can be observed without ambiguity. Empiricity also means that there is “an objective rule for classifying some aspect of observable objects as manifestations of the property” (Finkelstein 1982).