A commensurable characteristic (such as shape in the case of tables, or hue in
the case of colors) is an essential element in the process of
concept-formation. I shall designate it as the “Conceptual Common Denominator”
and define it as “The characteristic(s) reducible to a unit of measurement, by
means of which man differentiates two or more existents from other existents
possessing it.”
The distinguishing characteristic(s) of a concept represents a specified
category of measurements within the “Conceptual Common Denominator” involved.